Suppress leaks/uninitialized found in compositor_unittests

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 717 matching lines @@
    fun:FcInit
    fun:FcConfigGetCurrent
    fun:FcConfigSubstituteWithPat
    fun:_ZN12_GLOBAL__N_127FindBestMatchFontFamilyNameERKSt6vectorISsSaISsEE
    fun:_ZN3gfx17PlatformFontPangoC1EP21_PangoFontDescription
    fun:_ZN3gfx12PlatformFont20CreateFromNativeFontEP21_PangoFontDescription
    fun:_ZN3gfx4FontC1EP21_PangoFontDescription
    fun:_ZN3gfx17PlatformFontPangoC1Ev
    fun:_ZN3gfx12PlatformFont13CreateDefaultEv
 }
+# leak in OSMesa used to run compositor_unittests in bots.
+{
+   bug_148477
+   Memcheck:Leak
+   fun:malloc
+   ...
+   fun:_ZN6webkit3gpu33WebGraphicsContext3DInProcessImpl13compileShaderEj
+   fun:_ZN7WebCore18ProgramBindingBase10loadShaderEPN6WebKit20WebGraphicsContext3DEjRKN3WTF6StringE
+   fun:_ZN7WebCore18ProgramBindingBase4initEPN6WebKit20WebGraphicsContext3DERKN3WTF6StringES7_
+   ...
+   fun:_ZN7WebCore12CCRendererGL23initializeSharedObjectsEv
+   fun:_ZN7WebCore12CCRendererGL10initializeEv
+}
 
 #-----------------------------------------------------------------------
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 
 # See tools/valgrind/memcheck_analyze.py before modifying sanity tests.
 {
    Memcheck sanity test 01 (memory leak).
    Memcheck:Leak
    fun:_Zna*
@@ skipping 5238 matching lines @@
    fun:_ZN3ash5Shell4InitEv
 }
 {
    bug_147756_b
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN3ash*CreateContainersInRootWindowEPN4aura10RootWindowE
    fun:_ZN3ash8internal20RootWindowController16CreateContainersEv
    fun:_ZN3ash5Shell4InitEv
 }
+{
+   bug_148475
+   Memcheck:Uninitialized
+   ...
+   fun:_ZN7testing8internal24CmpHelperFloatingPointEQIfEENS_15AssertionResultEPKcS4_T_S5_
+   fun:_ZN2ui12_GLOBAL__N_143LayerAnimationElementTest_PauseElement_Test8TestBodyEv
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 
 {
    bug_todo_getdelim
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    ...
@@ skipping 31 matching lines @@
    bug_146950
    Memcheck:Leak
    fun:malloc
    fun:get_peer_sock_name
    fun:_xcb_get_auth_info
    fun:xcb_connect_to_display_with_auth_info
    fun:_XConnectXCB
    fun:XOpenDisplay
    fun:_ZN4base18MessagePumpAuraX1118GetDefaultXDisplayEv
 }
+