Valgrind: Add a new suppression and widen some existing suppressions.

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 # running overnight and removing outdated bugs/suppressions.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 6218 matching lines @@
    bug_397066_b
    Memcheck:Uninitialized
    ...
    fun:_ZN5blink13InlineFlowBox24computeLogicalBoxHeightsEPNS_13RootInlineBoxERNS_10LayoutUnitES4_RiS5_RbS6_bRN3WTF7HashMapIPKNS_13InlineTextBoxESt4pairINS7_6VectorIPKNS_14SimpleFontDataELm0ENS7_16DefaultAllocatorEEENS_13GlyphOverflowEENS7_7PtrHashISB_EENS7_10HashTraitsISB_EENSN_ISK_EESH_EENS_12FontBaselineERNS_21VerticalPositionCacheE
    fun:_ZN5blink13RootInlineBox26alignBoxesInBlockDirectionENS_10LayoutUnitERN3WTF7HashMapIPKNS_13InlineTextBoxESt4pairINS2_6VectorIPKNS_14SimpleFontDataELm0ENS2_16DefaultAllocatorEEENS_13GlyphOverflowEENS2_7PtrHashIS6_EENS2_10HashTraitsIS6_EENSI_ISF_EESC_EERNS_21VerticalPositionCacheE
    ...
    fun:_ZN5blink15RenderBlockFlow19layoutRunsAndFloatsERNS_15LineLayoutStateE
    fun:_ZN5blink15RenderBlockFlow20layoutInlineChildrenEbRNS_10LayoutUnitES2_S1_
    fun:_ZN5blink15RenderBlockFlow15layoutBlockFlowEbRNS_10LayoutUnitERNS_18SubtreeLayoutScopeE
    fun:_ZN5blink15RenderBlockFlow11layoutBlockEb
-   ...
-   fun:_ZN5blink11RenderBlock6layoutEv
 }
 {
    bug_397066_c
    Memcheck:Uninitialized
    ...
    fun:_ZN5blink13InlineFlowBox26placeBoxesInBlockDirectionENS_10LayoutUnitES1_ibRS1_S2_S2_RbS2_S2_S3_S3_NS_12FontBaselineE
    fun:_ZN5blink13RootInlineBox26alignBoxesInBlockDirectionENS_10LayoutUnitERN3WTF7HashMapIPKNS_13InlineTextBoxESt4pairINS2_6VectorIPKNS_14SimpleFontDataELm0ENS2_16DefaultAllocatorEEENS_13GlyphOverflowEENS2_7PtrHashIS6_EENS2_10HashTraitsIS6_EENSI_ISF_EESC_EERNS_21VerticalPositionCacheE
    ...
    fun:_ZN5blink15RenderBlockFlow19layoutRunsAndFloatsERNS_15LineLayoutStateE
    fun:_ZN5blink15RenderBlockFlow20layoutInlineChildrenEbRNS_10LayoutUnitES2_S1_
    fun:_ZN5blink15RenderBlockFlow15layoutBlockFlowEbRNS_10LayoutUnitERNS_18SubtreeLayoutScopeE
    fun:_ZN5blink15RenderBlockFlow11layoutBlockEb
-   ...
-   fun:_ZN5blink11RenderBlock6layoutEv
 }
 {
    bug_397066_d
    Memcheck:Uninitialized
    fun:_ZN5blink13InlineFlowBox45clearDescendantsHaveSameLineHeightAndBaselineEv
    fun:_ZN5blink13InlineFlowBox9addToLineEPNS_9InlineBoxE
    ...
    fun:_ZN5blink15RenderBlockFlow13constructLineERNS_11BidiRunListINS_7BidiRunEEERKNS_8LineInfoE
    fun:_ZN5blink15RenderBlockFlow27createLineBoxesFromBidiRuns*
 }
 {
    bug_397066_e
    Memcheck:Uninitialized
    fun:_ZN5blink13InlineFlowBox9addToLineEPNS_9InlineBox*
    fun:_ZN5blink15RenderBlockFlow*
    ...
    fun:_ZN5blink15RenderBlockFlow27createLineBoxesFromBidiRunsEjRNS*
    fun:_ZN5blink15RenderBlockFlow26layoutRunsAndFloatsInRangeERNS_15LineLayoutStateERNS_12BidiResolver*
    fun:_ZN5blink15RenderBlockFlow19layoutRunsAndFloatsERNS_15LineLayoutState*
 }
 {
+   bug_397066_f
+   Memcheck:Uninitialized
+   fun:_ZNK5blink13InlineFlowBox35constrainToLineTopAndBottomIfNeededERNS_10LayoutRectE
+   fun:_ZN5blink13InlineFlowBox28paintBoxDecorationBackgroundERNS_9PaintInfoERKNS_11LayoutPointE
+   fun:_ZN5blink13InlineFlowBox5paintERNS_9PaintInfoERKNS_11LayoutPointENS_10LayoutUnitES6_
+   fun:_ZN5blink13InlineFlowBox5paintERNS_9PaintInfoERKNS_11LayoutPointENS_10LayoutUnitES6_
+   fun:_ZN5blink13RootInlineBox5paintERNS_9PaintInfoERKNS_11LayoutPointENS_10LayoutUnitES6_
+   fun:_ZNK5blink17RenderLineBoxList5paintEPNS_20RenderBoxModelObjectERNS_9PaintInfoERKNS_11LayoutPointE
+}
+{
    bug_397075_a
    Memcheck:Uninitialized
    fun:_ZN2v88internal6Object11SetPropertyEPNS0_14LookupIteratorENS0_6HandleIS1_EENS0_10StrictModeENS1_14StoreFromKeyedE
    fun:_ZN2v88internal6Object11SetPropertyENS0_6HandleIS1_EENS2_INS0_4NameEEES3_NS0_10StrictModeENS1_14StoreFromKeyedE
    fun:_ZN2v88internal7Runtime17SetObjectPropertyEPNS0_7IsolateENS0_6HandleINS0_6ObjectEEES6_S6_NS0_10StrictModeE
    fun:_ZN2v86Object3SetENS_6HandleINS_5ValueEEES3_
    fun:_ZN18WebCoreTestSupport21injectInternalsObjectEN2v85LocalINS0_7ContextEEE
    fun:_ZN5blink17WebTestingSupport21injectInternalsObjectEPNS_13WebLocalFrameE
    fun:_ZN7content16WebKitTestRunner20DidClearWindowObjectEPN5blink13WebLocalFrameE
    fun:_ZN7content14RenderViewImpl20didClearWindowObjectEPN5blink13WebLocalFrameE
@@ skipping 86 matching lines @@
    fun:_ZN5blinkL21extractRangeComponentEPN3WTF6StringERKNS0_6RefPtrINS_10JSONObjectEEERKS1_Rj
    fun:_ZN5blinkL22jsonRangeToSourceRangeEPN3WTF6StringEPNS_23InspectorStyleSheetBase*
    fun:_ZN5blink17InspectorCSSAgent*
    fun:_ZThn40_N5blink17InspectorCSSAgent*
    fun:_ZN5blink30InspectorBackendDispatcherImpl*
    fun:_ZN5blink30InspectorBackendDispatcherImpl8dispatchERKN3WTF6StringE
    fun:_ZN5blink19InspectorController27dispatchMessageFromFrontendERKN3WTF6StringE
    fun:_ZN5blink20WebDevToolsAgentImpl26dispatchOnInspectorBackendERKNS_9WebStringE
    fun:_ZN7content13DevToolsAgent28OnDispatchOnInspectorBackendERKSs
 }