Suppress uninitialized read in content::PepperPluginInstanceImpl::UpdateLayer until it's fixed.

BUG=376814
TBR=jbauman@chromium.org

Review URL: https://codereview.chromium.org/298463004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272552 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -2171,6 +2171,10 @@ gpu.dll!gpu::gles2::ShaderTranslator::GetStringForOptionsThatWouldEffectCompilat
 *!gpu::gles2::ShaderTranslatorTest_OptionsString_Test::TestBody
 
 UNINITIALIZED READ
-name=374410
+name=bug_374410
 *!ui::NativeThemeWin::PaintScrollbarTrack
 *!ui::NativeThemeWin::PaintDirect
+
+UNINITIALIZED READ
+name=bug_376814
+*!content::PepperPluginInstanceImpl::UpdateLayer