Suppress memcheck leaks and update a TSAN rule.

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 # running overnight and removing outdated bugs/suppressions.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 5111 matching lines @@
    bug_102016_b
    Memcheck:Leak
    fun:posix_memalign
    ...
    fun:av_read_frame
    fun:_ZN5media15AudioFileReader4ReadERKSt6vectorIPfSaIS2_EEj
    fun:_ZN11webkit_glue19DecodeAudioFileDataEPN6WebKit11WebAudioBusEPKcjd
    fun:_ZN11webkit_glue25WebKitPlatformSupportImpl17loadAudioResourceEPN6WebKit11WebAudioBusEPKcjd
    fun:_ZN7WebCore15PlatformSupport19decodeAudioFileDataEPKcjd
 }
+{
+   bug_102049_a
+   Memcheck:Leak
+   fun:malloc
+   fun:_Z15sk_malloc_flagsjj
+   fun:_Z15sk_malloc_throwj
+   fun:_ZN8SkAAClip7RunHead5AllocEij
+   fun:_ZN8SkAAClip7Builder6finishEPS_
+   ...
+   fun:_ZN8SkCanvas8clip*ERK6Sk*N8SkRegion2OpEb
+}
+{
+   bug_102049_b
+   Memcheck:Leak
+   fun:malloc
+   fun:_Z15sk_malloc_flagsjj
+   fun:_Z15sk_malloc_throwj
+   fun:_ZN8SkAAClip7RunHead5AllocEij
+   fun:_ZN8SkAAClip7Builder6finishEPS_
+   ...
+   fun:_ZN8SkCanvas19updateDeviceCMCacheEv
+   fun:_ZN10SkDrawIterC1EP8SkCanvasb
+   fun:_ZN8SkCanvas8draw*ERK6Sk*RK7SkPaint
+}
 
 #-----------------------------------------------------------------------
 # 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
 }