Collect UMA statistics on which chrome://flags lead to chrome restart on ChromeOS.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index bba0069b55ea8d66ca9883825aac51903da77ba4..d9743bd50cf86ba67c595f851d6e487f1104f648 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9518,6 +9518,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Login.CustomFlags" enum="LoginCustomFlags">
+  <owner>alemate@chromium.org</owner>
+  <summary>
+    A set of chrome flags that required browser restart on Chrome OS user sign
+    in.
+  </summary>
+</histogram>
+
 <histogram name="Login.FailureReason" enum="LoginFailureReason">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>Chrome OS login failure reason.</summary>
@@ -39272,6 +39280,254 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="1" label="ONLY_WHITELISTED_ALLOWED">Whitelisted users only</int>
 </enum>
 
+<enum name="LoginCustomFlags" type="int">
+  <summary>Chrome flags that lead to chrome restart on ChromeOS.</summary>
+  <int value="0" label="UNKNOWN_FLAG">Unknown flag.</int>
+  <int value="1" label="BAD_FLAG_FORMAT">Bad flag format.</int>
+  <int value="2" label="reserved2">ID 2 reserved for future use.</int>
+  <int value="3" label="reserved3">ID 3 reserved for future use.</int>
+  <int value="4" label="reserved4">ID 4 reserved for future use.</int>
+  <int value="5" label="disable-webrtc-hw-encoding"/>
+  <int value="6" label="disable-minimize-on-second-launcher-item-click"/>
+  <int value="7" label="disable-virtual-keyboard-overscroll"/>
+  <int value="8" label="disable-virtual-keyboard-overscroll"/>
+  <int value="9" label="enable-pinch-virtual-viewport"/>
+  <int value="10" label="prefetch-search-results"/>
+  <int value="11" label="enable-experimental-app-list"/>
+  <int value="12" label="enable-devtools-experiments"/>
+  <int value="13" label="enable-centered-app-list"/>
+  <int value="14" label="enable-accelerated-overflow-scroll"/>
+  <int value="15" label="enable-tcp-fastopen"/>
+  <int value="16" label="enable-zero-suggest-personalized"/>
+  <int value="17" label="enable-experimental-web-platform-features"/>
+  <int value="18" label="use-simple-cache-backend"/>
+  <int value="19" label="disable-search-button-in-omnibox"/>
+  <int value="20" label="file-manager-enable-new-audio-player"/>
+  <int value="21" label="disable-prefixed-encrypted-media"/>
+  <int value="22" label="disable-origin-chip"/>
+  <int value="23" label="disable-touch-adjustment"/>
+  <int value="24" label="disable-offline-auto-reload"/>
+  <int value="25" label="enable-fixed-position-compositing"/>
+  <int value="26" label="enable-nacl"/>
+  <int value="27" label="disable-saml-signin"/>
+  <int value="28" label="disable-views-rect-based-targeting"/>
+  <int value="29" label="enable-linkable-ephemeral-apps"/>
+  <int value="30" label="enable-zero-copy"/>
+  <int value="31" label="enable-session-crashed-bubble"/>
+  <int value="32" label="enable-spelling-auto-correct"/>
+  <int value="33" label="disable-suggestions-service"/>
+  <int value="34" label="disable-app-list-app-info"/>
+  <int value="35" label="allow-insecure-websocket-from-https-origin"/>
+  <int value="36" label="enable-input-view"/>
+  <int value="37" label="enable-web-midi"/>
+  <int value="38" label="disable-app-list-voice-search"/>
+  <int value="39" label="disable-offline-load-stale-cache"/>
+  <int value="40" label="manual-enhanced-bookmarks"/>
+  <int value="41" label="num-raster-threads"/>
+  <int value="42" label="disable-cast"/>
+  <int value="43" label="enable-instant-search-clicks"/>
+  <int value="44" label="enable-zero-suggest-ether-noserp"/>
+  <int value="45" label="enable-overlay-scrollbar"/>
+  <int value="46" label="enable-spdy4"/>
+  <int value="47" label="disable-boot-animation"/>
+  <int value="48" label="disable-password-generation"/>
+  <int value="49" label="disable-software-rasterizer"/>
+  <int value="50" label="enable-avfoundation"/>
+  <int value="51" label="disable-spdy-proxy-dev-auth-origin"/>
+  <int value="52" label="disable-new-profile-management"/>
+  <int value="53" label="mediadrm-enable-non-compositing"/>
+  <int value="54" label="disable-text-input-focus-manager"/>
+  <int value="55" label="enable-smooth-scrolling"/>
+  <int value="56" label="enable-password-generation"/>
+  <int value="57" label="disable-device-discovery"/>
+  <int value="58" label="scroll-end-effect"/>
+  <int value="59" label="enable-delegated-renderer"/>
+  <int value="60" label="ash-enable-touch-view-testing"/>
+  <int value="61" label="touch-events"/>
+  <int value="62" label="disable-new-ntp"/>
+  <int value="63" label="disable-permissions-bubbles"/>
+  <int value="64" label="enable-network-portal-notification"/>
+  <int value="65" label="disable-media-source"/>
+  <int value="66" label="enable-encrypted-media"/>
+  <int value="67" label="enable-apps-file-associations"/>
+  <int value="68" label="enable-search-button-in-omnibox-for-str"/>
+  <int value="69" label="disable-sync-app-list"/>
+  <int value="70" label="file-manager-enable-new-gallery"/>
+  <int value="71" label="enable-fast-unload"/>
+  <int value="72" label="disable-fast-text-autosizing"/>
+  <int value="73" label="tab-capture-upscale-quality"/>
+  <int value="74" label="disable-threaded-compositing"/>
+  <int value="75" label="enable-accelerated-fixed-root-background"/>
+  <int value="76" label="enable-lcd-text"/>
+  <int value="77" label="nacl-debug-mask"/>
+  <int value="78" label="disable-transition-compositing"/>
+  <int value="79" label="enable-embeddedsearch-api"/>
+  <int value="80" label="enable-settings-window"/>
+  <int value="81" label="force-device-scale-factor"/>
+  <int value="82" label="disable-password-manager-reauthentication"/>
+  <int value="83" label="disable-pinch-virtual-viewport"/>
+  <int value="84" label="disable-webgl"/>
+  <int value="85" label="save-page-as-mhtml"/>
+  <int value="86" label="disable-zero-suggest"/>
+  <int value="87" label="show-composited-layer-borders"/>
+  <int value="88" label="enable-zero-suggest-most-visited"/>
+  <int value="89" label="enable-answers-in-suggest"/>
+  <int value="90" label="malware-interstitial-v3"/>
+  <int value="91" label="enable-virtual-keyboard"/>
+  <int value="92" label="disable-quic"/>
+  <int value="93" label="default-tile-width"/>
+  <int value="94" label="enable-automatic-password-saving"/>
+  <int value="95" label="enable-search-button-in-omnibox-always"/>
+  <int value="96" label="disable-input-view"/>
+  <int value="97" label="enable-one-copy"/>
+  <int value="98" label="overscroll-history-navigation"/>
+  <int value="99" label="enable-quic-https"/>
+  <int value="100" label="js-flags"/>
+  <int value="101" label="enable-nacl-debug"/>
+  <int value="102" label="enable-viewport-meta"/>
+  <int value="103" label="enable-experimental-input-view-features"/>
+  <int value="104" label="disable-gpu-rasterization"/>
+  <int value="105" label="enable-print-preview-register-promos"/>
+  <int value="106" label="enable-simplified-fullscreen"/>
+  <int value="107" label="enable-accessibility-tab-switcher"/>
+  <int value="108" label="enable-quic"/>
+  <int value="109" label="enable-origin-chip-on-srp"/>
+  <int value="110" label="fast-user-switching"/>
+  <int value="111" label="enable-touch-editing"/>
+  <int value="112" label="wallet-service-use-sandbox"/>
+  <int value="113" label="enable-carrier-switching"/>
+  <int value="114" label="disable-contextual-search"/>
+  <int value="115" label="enable-zero-suggest-ether-serp"/>
+  <int value="116" label="enable-cloud-devices"/>
+  <int value="117" label="disable-quic-https"/>
+  <int value="118" label="enable-touch-drag-drop"/>
+  <int value="119" label="enable-permissions-bubbles"/>
+  <int value="120" label="enable-first-run-ui-transitions"/>
+  <int value="121" label="disable-device-discovery-notifications"/>
+  <int value="122" label="enable-threaded-compositing"/>
+  <int value="123" label="enable-easy-unlock"/>
+  <int value="124" label="enable-origin-chip-always"/>
+  <int value="125" label="enable-pinch"/>
+  <int value="126" label="enable-bleeding-edge-rendering-fast-paths"/>
+  <int value="127" label="disable-lcd-text"/>
+  <int value="128" label="enable-streamlined-hosted-apps"/>
+  <int value="129" label="disable-webrtc"/>
+  <int value="130" label="enable-save-password-bubble"/>
+  <int value="131" label="enable-apps-show-on-first-paint"/>
+  <int value="132" label="enable-new-ntp"/>
+  <int value="133" label="enable-text-input-focus-manager"/>
+  <int value="134" label="enable-service-worker-sync"/>
+  <int value="135" label="enable-harfbuzz-rendertext"/>
+  <int value="136" label="enable-download-resumption"/>
+  <int value="137" label="new-profile-management"/>
+  <int value="138" label="disable-touch-editing"/>
+  <int value="139" label="google-profile-info"/>
+  <int value="140" label="enable-impl-side-painting"/>
+  <int value="141" label="enable-distance-field-text"/>
+  <int value="142" label="enable-deferred-image-decoding"/>
+  <int value="143" label="manual-enhanced-bookmarks-optout"/>
+  <int value="144" label="enable-search-button-in-omnibox-for-str-or-iip"/>
+  <int value="145" label="enable-offline-auto-reload"/>
+  <int value="146" label="enable-experimental-canvas-features"/>
+  <int value="147" label="enable-app-install-alerts"/>
+  <int value="148" label="enable-cloud-print-xps"/>
+  <int value="149" label="max-tiles-for-interest-area"/>
+  <int value="150" label="enable-app-list"/>
+  <int value="151" label="disable-accelerated-video-decode"/>
+  <int value="152" label="out-of-process-pdf"/>
+  <int value="153" label="disable-session-crashed-bubble"/>
+  <int value="154" label="enable-swipe-selection"/>
+  <int value="155" label="disable-fixed-position-compositing"/>
+  <int value="156" label="enable-web-based-signin"/>
+  <int value="157" label="ssl-interstitial-v2-gray"/>
+  <int value="158" label="enable-sync-app-list"/>
+  <int value="159" label="disable-compositor-touch-hit-testing"/>
+  <int value="160" label="disable-accelerated-fixed-root-background"/>
+  <int value="161" label="enhanced-bookmarks-experiment"/>
+  <int value="162" label="disable-pnacl"/>
+  <int value="163" label="extension-content-verification"/>
+  <int value="164" label="disable-touch-drag-drop"/>
+  <int value="165" label="default-tile-height"/>
+  <int value="166" label="disable-sync-synced-notifications"/>
+  <int value="167" label="new-avatar-menu"/>
+  <int value="168" label="allow-nacl-socket-api"/>
+  <int value="169" label="enable-experimental-extension-apis"/>
+  <int value="170" label="enable-app-window-controls"/>
+  <int value="171" label="silent-debugger-extension-api"/>
+  <int value="172" label="enable-suggestions-service"/>
+  <int value="173" label="enable-contextual-search"/>
+  <int value="174" label="enable-fast-text-autosizing"/>
+  <int value="175" label="ash-touch-hud"/>
+  <int value="176" label="disable-accelerated-overflow-scroll"/>
+  <int value="177" label="disable-async-dns"/>
+  <int value="178" label="disable-webaudio"/>
+  <int value="179" label="disable-delegated-renderer"/>
+  <int value="180" label="disable-save-password-bubble"/>
+  <int value="181" label="enable-offline-load-stale-cache"/>
+  <int value="182" label="disable-display-color-calibration"/>
+  <int value="183" label="debug-packed-apps"/>
+  <int value="184" label="enable-gpu-rasterization"/>
+  <int value="185" label="disable-impl-side-painting"/>
+  <int value="186" label="disable-distance-field-text"/>
+  <int value="187" label="performance-monitor-gathering"/>
+  <int value="188" label="disable-pinch"/>
+  <int value="189" label="enable-syncfs-directory-operation"/>
+  <int value="190" label="disable-ntp-other-sessions-menu"/>
+  <int value="191" label="enable-spelling-feedback-field-trial"/>
+  <int value="192" label="ssl-interstitial-v1"/>
+  <int value="193" label="disable-gesture-requirement-for-media-playback"/>
+  <int value="194" label="touch-scrolling-mode"/>
+  <int value="195" label="enable-touchpad-three-finger-click"/>
+  <int value="196" label="disable-quickoffice-component-app"/>
+  <int value="197" label="enable-transition-compositing"/>
+  <int value="198" label="disable-account-consistency"/>
+  <int value="199" label="enable-request-tablet-site"/>
+  <int value="200" label="tab-capture-downscale-quality"/>
+  <int value="201" label="enable-service-worker"/>
+  <int value="202" label="ash-debug-shortcuts"/>
+  <int value="203" label="enable-sync-synced-notifications"/>
+  <int value="204" label="ignore-gpu-blacklist"/>
+  <int value="205" label="ssl-interstitial-v2-colorful"/>
+  <int value="206" label="do-not-ignore-autocomplete-off"/>
+  <int value="207" label="disable-accelerated-2d-canvas"/>
+  <int value="208" label="enable-gesture-tap-highlight"/>
+  <int value="209" label="reset-app-list-install-state"/>
+  <int value="210" label="enable-scroll-prediction"/>
+  <int value="211" label="enable-ephemeral-apps"/>
+  <int value="212" label="enable-webgl-draft-extensions"/>
+  <int value="213" label="disable-network-portal-notification"/>
+  <int value="214" label="enable-device-discovery-notifications"/>
+  <int value="215" label="disable-layer-squashing"/>
+  <int value="216" label="disable-gesture-tap-highlight"/>
+  <int value="217" label="enable-offline-auto-reload-visible-only"/>
+  <int value="218" label="enable-spdy-proxy-dev-auth-origin"/>
+  <int value="219" label="enable-translate-new-ux"/>
+  <int value="220" label="no-pings"/>
+  <int value="221" label="enable-scripts-require-action"/>
+  <int value="222" label="disable-webrtc-hw-decoding"/>
+  <int value="223" label="enable-virtual-keyboard-overscroll"/>
+  <int value="224" label="disable-direct-write"/>
+  <int value="225" label="extensions-on-chrome-urls"/>
+  <int value="226" label="malware-interstitial-v2"/>
+  <int value="227" label="enable-account-consistency"/>
+  <int value="228" label="disable-offline-auto-reload-visible-only"/>
+  <int value="229" label="disable-settings-window"/>
+  <int value="230" label="disable-embedded-shared-worker"/>
+  <int value="231" label="show-autofill-type-predictions"/>
+  <int value="232" label="enable-async-dns"/>
+  <int value="233" label="enable-prominent-url-app-flow"/>
+  <int value="234" label="enable-high-dpi-fixed-position-compositing"/>
+  <int value="235" label="force-gpu-rasterization"/>
+  <int value="236" label="disable-device-enumeration"/>
+  <int value="237" label="show-fps-counter"/>
+  <int value="238" label="apps-keep-chrome-alive"/>
+  <int value="239" label="enable-filemanager-mtp"/>
+  <int value="240" label="enable-panels"/>
+  <int value="241" label="disable-overlay-scrollbar"/>
+  <int value="242" label="disable-zero-copy"/>
+  <int value="243" label="disable-click-delay"/>
+</enum>
+
 <enum name="LoginFailureReason" type="int">
   <int value="0" label="NONE">None</int>
   <int value="1" label="COULD_NOT_MOUNT_CRYPTOHOME">