[Garbled Text][Infobar] Adding infobar to suggest turning on encoding detection.

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 55b3ddad597430a0fecc7289d7e2a316f4912cdc..a7a622ee71d87ff0041adad37521a9c64e60781b 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -230,6 +230,7 @@ ChromeRenderViewObserver::ChromeRenderViewObserver(
       last_indexed_page_id_(-1),
       allow_displaying_insecure_content_(false),
       allow_running_insecure_content_(false),
+      garbled_text_detection_enabled_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kDomAutomationController)) {
@@ -270,6 +271,9 @@ bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ChromeViewMsg_AddStrictSecurityHost,
                         OnAddStrictSecurityHost)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAsInterstitial, OnSetAsInterstitial)
+    IPC_MESSAGE_HANDLER(ChromeViewMsg_ReloadFromCache, OnReloadFromCache)
+    IPC_MESSAGE_HANDLER(ChromeViewMsg_SetGarbledTextDetectionEnableState,
+                        OnSetGarbledTextDetectionEnableState)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -371,6 +375,17 @@ void ChromeRenderViewObserver::OnSetAsInterstitial() {
   content_settings_->SetAsInterstitial();
 }
 
+void ChromeRenderViewObserver::OnReloadFromCache() {
+  WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
+  if (main_frame)
+    main_frame->reloadFromCache();
+}
+
+void ChromeRenderViewObserver::OnSetGarbledTextDetectionEnableState(
+    bool enabled) {
+  garbled_text_detection_enabled_ = enabled;
+}
+
 void ChromeRenderViewObserver::Navigate(const GURL& url) {
   // Execute cache clear operations that were postponed until a navigation
   // event (including tab reload).
@@ -810,6 +825,20 @@ void ChromeRenderViewObserver::CapturePageInfo(int load_id,
     return;
   }
 
+  if (garbled_text_detection_enabled_) {
+    std::vector<GURL> garbled_urls;
+    for (WebKit::WebFrame* frame = render_view()->GetWebView()->mainFrame();
+         frame; frame = frame->traverseNext(false)) {
+      if (frame->document().shouldUseEncodingDetector())
+        garbled_urls.push_back(frame->document().url());
+    }
+
+    if (!garbled_urls.empty()) {
+      Send(new ChromeViewHostMsg_GarbledTextDetected(
+          routing_id(), garbled_urls));
+    }
+  }
+
   // If the page id is unchanged, check whether the URL (ignoring fragments)
   // has changed.  If so, we need to reindex.  Otherwise, assume this is a
   // reload, in-page navigation, or some other load type where we don't want to