Suppress a flaky uninit in IdleHandlerInForegroundTab.

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 # running overnight and removing outdated bugs/suppressions.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 5261 matching lines @@
    fun:_ZN7WebCore8Document41styleForElementIgnoringPendingStylesheetsEPNS_7ElementE
    fun:_ZN7WebCore7Element13computedStyleENS_8PseudoIdE
    fun:_ZN7WebCore16HTMLTitleElement17textWithDirectionEv
    fun:_ZN7WebCore16HTMLTitleElement15childrenChangedEbPNS_4NodeES2_i
    fun:_ZN7WebCore13ContainerNode14parserAddChildEN3WTF10PassRefPtrINS_4NodeEEE
    fun:_ZN7WebCore20HTMLConstructionSite12attachAtSiteERKNS0_14AttachmentSiteEN3WTF10PassRefPtrINS_4NodeEEE
    fun:_ZN7WebCore20HTMLConstructionSite14insertTextNodeERKN3WTF6StringE
    fun:_ZN7WebCore15HTMLTreeBuilder22processCharacterBufferERNS0_28ExternalCharacterTokenBufferE
    fun:_ZN7WebCore15HTMLTreeBuilder16processCharacterERNS_15AtomicHTMLTokenE
 }
+{
+   bug_106067
+   Memcheck:Uninitialized
+   fun:_ZN16RenderThreadImpl26IdleHandlerInForegroundTabEv
+   fun:_ZN16RenderThreadImpl11IdleHandlerEv
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 {
    bug_todo_freeres
    Memcheck:Free
    fun:free
    fun:__libc_freeres
    fun:_vgnU_freeres
    fun:_Exit
@@ skipping 17 matching lines @@
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }