Support impl-side painting in Mandoline.

mojo/cc/context_provider_mojo.cc

Index: mojo/cc/context_provider_mojo.cc
diff --git a/mojo/cc/context_provider_mojo.cc b/mojo/cc/context_provider_mojo.cc
index fc3b720625f3a01e2e757adc4b34560fd4504297..40bcddb1a50360a6f55fc0c4c6c1666e01fe1cbc 100644
--- a/mojo/cc/context_provider_mojo.cc
+++ b/mojo/cc/context_provider_mojo.cc
@@ -13,6 +13,7 @@ namespace mojo {
 ContextProviderMojo::ContextProviderMojo(
     ScopedMessagePipeHandle command_buffer_handle)
     : command_buffer_handle_(command_buffer_handle.Pass()) {
+  capabilities_.gpu.image = true;

[danakj, 2015/06/15 18:20:36]

Can you also comment here pointing readers to some context?

[jam, 2015/06/15 22:06:01]

like what kind of comment? for comparison, content also doesn't really document
this flag or others when it sets them.

[danakj, 2015/06/15 22:11:20]

Something like "Enabled the CHROMIUM_image extension to use GpuMemoryBuffers.
The implementation of which is used in FooClassName."

I wish content/ did too.

[jam, 2015/06/15 22:44:55]

Done.

 }
 
 bool ContextProviderMojo::BindToCurrentThread() {