Update from https://crrev.com/327068

tools/valgrind/drmemory/suppressions.txt

Index: tools/valgrind/drmemory/suppressions.txt
diff --git a/tools/valgrind/drmemory/suppressions.txt b/tools/valgrind/drmemory/suppressions.txt
index 4e084a703f41df6cb916936a0623c2a0dfee2d23..e54404bc5963040be230c4b5eef03f39700bc010 100644
--- a/tools/valgrind/drmemory/suppressions.txt
+++ b/tools/valgrind/drmemory/suppressions.txt
@@ -478,10 +478,8 @@ HANDLE LEAK
 name=http://crbug.com/371368
 system call NtCreateNamedPipeFile
 KERNELBASE.dll!CreateNamedPipeW
-ipc.dll!IPC::Channel::ChannelImpl::CreatePipe
-ipc.dll!IPC::Channel::ChannelImpl::ChannelImpl
-ipc.dll!IPC::Channel::Channel
-ipc.dll!IPC::ChannelProxy::Context::CreateChannel
+ipc.dll!IPC::ChannelWin::CreatePipe
+ipc.dll!IPC::ChannelWin::ChannelWin
 
 HANDLE LEAK
 name=http://crbug.com/371942
@@ -755,7 +753,24 @@ UNADDRESSABLE ACCESS
 name=http://crbug.com/463261
 ...
 blink_web.dll!blink::WebFrameWidgetImpl::selectionBounds
-content.dll!content::RenderWidget::GetSelectionBounds
+...
 content.dll!content::RenderWidget::UpdateSelectionBounds
 content.dll!content::RenderWidget::willBeginCompositorFrame
 cc.dll!base::internal::InvokeHelper<>::MakeItSo
+
+UNADDRESSABLE ACCESS
+name=http://crbug.com/476586
+*!blink::WebFrameWidgetImpl::beginFrame
+*!content::RenderWidgetCompositor::BeginMainFrame
+*!cc::LayerTreeHost::BeginMainFrame
+*!cc::ThreadProxy::BeginMainFrame
+*!base::internal::InvokeHelper<>::MakeItSo
+
+UNADDRESSABLE ACCESS
+name=http://crbug.com/476586b
+*!blink::PageWidgetDelegate::animate
+*!blink::WebFrameWidgetImpl::beginFrame
+*!content::RenderWidgetCompositor::BeginMainFrame
+*!cc::LayerTreeHost::BeginMainFrame
+*!cc::ThreadProxy::BeginMainFrame
+*!base::internal::InvokeHelper<>::MakeItSo