cc: Route offscreen context creation for compositor to the browser.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 599766b7d0ab21627e93f59df9225a9b8e16c9f0..6d840949abb942421692bb0e8c4e80d2e23a782d 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -17,6 +17,7 @@
 #include "content/renderer/gpu/compositor_thread.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayerTreeViewClient.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
 #include "webkit/compositor_bindings/web_layer_impl.h"
 #include "webkit/compositor_bindings/web_to_ccinput_handler_adapter.h"
@@ -287,6 +288,31 @@ void RenderWidgetCompositor::didRecreateOutputSurface(bool success) {
   client_->didRecreateOutputSurface(success);
 }
 
+// TODO(danakj): This should go through WebWidget
+WebKit::WebGraphicsContext3D* RenderWidgetCompositor::
+    offscreenContext3dForMainThread() {
+  return WebKit::WebSharedGraphicsContext3D::mainThreadContext();
+}
+
+// TODO(danakj): This should go through WebWidget
+WebKit::WebGraphicsContext3D* RenderWidgetCompositor::
+    offscreenContext3dForCompositorThread() {
+  if (!WebKit::WebSharedGraphicsContext3D::haveCompositorThreadContext() &&
+      !WebKit::WebSharedGraphicsContext3D::createCompositorThreadContext())
+    return NULL;
+  return WebKit::WebSharedGraphicsContext3D::compositorThreadContext();

[jamesr, 2013/02/09 02:48:12]

this will go to the new content/common/gpu/offscreen_context class, right?

[danakj, 2013/02/09 02:50:51]

Ya this calls
RenderThreadImpl::current()->OffscreenContext3dForCompositorThread().

RenderThreadImpl owns two OffscreenContextCommandBuffer classes (one for each
thread).

+}
+
+// TODO(danakj): This should go through WebWidget
+GrContext* RenderWidgetCompositor::offscreenGrContextForMainThread() {
+  return WebKit::WebSharedGraphicsContext3D::mainThreadGrContext();
+}
+
+// TODO(danakj): This should go through WebWidget
+GrContext* RenderWidgetCompositor::offscreenGrContextForCompositorThread() {
+  return WebKit::WebSharedGraphicsContext3D::compositorThreadGrContext();
+}
+
 // TODO(jamesr): This should go through WebWidget
 scoped_ptr<cc::InputHandler> RenderWidgetCompositor::createInputHandler() {
   scoped_ptr<cc::InputHandler> ret;