Update from https://crrev.com/306655

tools/valgrind/memcheck/suppressions_linux.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
 #
 # TODO(rnk): Should we move all of the Linux-only system library suppressions
 # over from suppressions.txt?  We'd avoid wasting time parsing and matching
 # suppressions on non-Linux, which is basically just Mac.
 #
 #-----------------------------------------------------------------------
 
 # 1. Third party stuff we have no control over.
 
 # 2. Intentional unit test errors, 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.
-
+{
+   bug_436253
+   Memcheck:Overlap
+   fun:memcpy@@GLIBC_2.14
+   fun:_ZN7content14WebPreferencesaSERKS0_
+   fun:_ZN7content14RenderViewImpl22OnUpdateWebPreferencesERKNS_14WebPreferencesE
+   fun:_ZN7content14RenderViewImpl20SetWebkitPreferencesERKNS_14WebPreferencesE
+   fun:_ZThn784_N7content14RenderViewImpl20SetWebkitPreferencesERKNS_14WebPreferencesE
+   fun:_ZN7content16WebKitTestRunner5ResetEv
+}
+{
+   bug_436292
+   Memcheck:Param
+   sendmsg(msg.msg_iov[0])
+   ...
+   fun:MojoWriteMessage
+   fun:_ZN3IPC8internal13MessageReader4SendE10scoped_ptrINS_7MessageEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN3IPC11ChannelMojo4SendEPNS_7MessageE
+   fun:_ZN7content20BrowserMessageFilter4SendEPN3IPC7MessageE
+   fun:_ZN7content17AudioRendererHost18DoCompleteCreationEi
+}
+{
+   bug_436292_b
+   Memcheck:Param
+   sendmsg(msg.msg_iov[0])
+   ...
+   fun:MojoWriteMessage
+   fun:_ZN3IPC8internal13MessageReader4SendE10scoped_ptrINS_7MessageEN4base14DefaultDeleterIS3_EEE
+   fun:_ZN3IPC11ChannelMojo17InitMessageReaderEN4mojo16ScopedHandleBaseINS1_17MessagePipeHandleEEEi
+   fun:_ZN3IPC12_GLOBAL__N_117ServerChannelMojo27ClientChannelWasInitializedEi
+}