Revert of Flood-fill the canvas used for layout tests

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 # running overnight and removing outdated bugs/suppressions.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 6340 matching lines @@
 {
    bug_331925
    Memcheck:Leak
    ...
    fun:_ZN3net27TestURLRequestContextGetter20GetURLRequestContextEv
    fun:_ZN3net14URLFetcherCore30StartURLRequestWhenAppropriateEv
    fun:_ZN3net14URLFetcherCore19DidInitializeWriterEi
    fun:_ZN3net14URLFetcherCore15StartOnIOThreadEv
 }
 {
+   bug_332271a
+   Memcheck:Param
+   write(buf)
+   obj:*libpthread*
+   fun:_ZN3IPC7Channel11ChannelImpl23ProcessOutgoingMessagesEv
+   fun:_ZN3IPC7Channel11ChannelImpl29OnFileCanWriteWithoutBlockingEi
+   fun:_ZN4base19MessagePumpLibevent21FileDescriptorWatcher29OnFileCanWriteWithoutBlocking*
+   fun:_ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv
+}
+{
+   bug_332271b
+   Memcheck:Param
+   write(buf)
+   obj:*libpthread*
+   fun:_ZN3IPC7Channel11ChannelImpl23ProcessOutgoingMessagesEv
+   fun:_ZN3IPC7Channel11ChannelImpl4SendEPNS_7MessageE
+   fun:_ZN3IPC7Channel4SendEPNS_7MessageE
+   fun:_ZN3IPC12ChannelProxy7Context13OnSendMessage*
+}
+{
    bug_332328
    Memcheck:Leak
    fun:malloc
    fun:_ZN3WTF10fastMallocEm
    fun:_ZN7WebCore14XMLHttpRequestnwEm
    fun:_ZN7WebCore14XMLHttpRequest6createEPNS_16ExecutionContextEN3WTF10PassRefPtrINS_14SecurityOriginEEE
    fun:_ZN7WebCore16V8XMLHttpRequest17constructorCustomERKN2v820FunctionCallbackInfoINS1_5ValueEEE
    fun:_ZN7WebCore16V8XMLHttpRequest19constructorCallbackERKN2v820FunctionCallbackInfoINS1_5ValueEEE
    fun:_ZN2v88internal25FunctionCallbackArguments4CallEPFvRKNS_20FunctionCallbackInfoINS_5ValueEEEE
 }
@@ skipping 22 matching lines @@
 }
 {
    bug_332335
    Memcheck:Param
    sendmsg(msg.msg_iov[0])
    fun:sys_sendmsg
    fun:_ZN8breakpad12_GLOBAL__N_122NonBrowserCrashHandlerEPKvmPv
    fun:_ZN15google_breakpad16ExceptionHandler12HandleSignalEiP7siginfoPv
    fun:_ZN15google_breakpad16ExceptionHandler13SignalHandlerEiP7siginfoPv
 }