suppress uninit error from WebCore::PinchViewport::PinchViewport

TBR=bokan@chromium.org
TEST=waterfall
BUG=372226

Review URL: https://codereview.chromium.org/272403003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269717 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -2153,3 +2153,10 @@ system call NtWriteFile parameter #5
 KERNELBASE.dll!WriteFile
 KERNEL32.dll!WriteFile
 ipc.dll!IPC::Channel::ChannelImpl::ProcessOutgoingMessages
+
+UNINITIALIZED READ
+name=bug_372226
+...
+*!WebCore::PinchViewport::reset
+*!WebCore::PinchViewport::PinchViewport
+*!WebCore::FrameHost::FrameHost

tools/valgrind/memcheck/suppressions.txt

@@ -6433,3 +6433,13 @@
    fun:_ZN2ui14EventProcessor17OnEventFromSourceEPNS_5EventE
    fun:_ZN4aura4test12AuraTestBase34DispatchEventUsingWindowDispatcherEPN2ui5EventE
 }
+{
+   bug_372226
+   Memcheck:Uninitialized
+   ...
+   fun:_ZN7WebCore13PinchViewport5resetEv
+   ...
+   fun:_ZN7WebCore13PinchViewportC1ERNS_9FrameHostE
+   ...
+   fun:_ZN7WebCore9FrameHostC1ERNS_4PageE
+}