Valgrind: Suppress a couple more errors and disable a flaky test.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 148979)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -5752,6 +5752,24 @@
    fun:_ZN6syncer15SyncManagerImpl4Init*
    fun:_ZN12browser_sync15SyncBackendHost4Core12DoInitializeERKNS0_19DoInitializeOptionsE
 }
+{
+   bug_139662
+   Memcheck:Uninitialized
+   fun:qcms_transform_data_rgba_out_lut_sse2
+   fun:qcms_transform_data_type
+   fun:_ZN7WebCore16JPEGImageDecoder15outputScanlinesEv
+   fun:_ZN7WebCore15JPEGImageReader6decodeERKNS_12SharedBufferEb
+}
+{
+   bug_139664
+   Memcheck:Uninitialized
+   fun:_ZN4skia12_GLOBAL__N_18ClampTo8Ei
+   fun:_ZN4skia12_GLOBAL__N_120ConvolveHorizontallyILb1EEEvPKhRKNS_19ConvolutionFilter1DEPh
+   fun:_ZN4skia14BGRAConvolve2DEPKhibRKNS_19ConvolutionFilter1DES4_iPhb
+   fun:_ZN4skia15ImageOperations11ResizeBasicERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
+   fun:_ZN4skia15ImageOperations6ResizeERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
+   fun:_ZNK7WebCore15NativeImageSkia13resizedBitmapERK7SkIRectiiS3_
+}
 
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 # 4. These only occur on our Google workstations