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

Currently the compositor asks WebKit for the SharedGraphicsContext. For the
browser compositor, we instead route requests for an offscreen context to
ui/compositor, where we are able to create the context.

This patch only addresses offscreen contexts for the browser compositor. The
renderer compositor still gets its contexts from WebKit, but now via the
LayerTreeHostClient interface instead of directly going to the
WebSharedGraphicsContext3D.

Tested by the lost context unit tests. They now test that on context loss, the 
shared context is also recreated, and that if it fails to be recreated that we 
retry context creation.

BUG=169373,175383

Review URL: https://chromiumcodereview.appspot.com/12212007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@184165 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/cc/test/test_web_graphics_context_3d.h b/cc/test/test_web_graphics_context_3d.h
index abfd9c9..212da16 100644
--- a/cc/test/test_web_graphics_context_3d.h
+++ b/cc/test/test_web_graphics_context_3d.h
@@ -122,6 +122,11 @@ class TestWebGraphicsContext3D : public FakeWebGraphicsContext3D {
     have_extension_egl_image_ = have;
   }
 
+  // When this context is lost, all contexts in its share group are also lost.
+  void add_share_group_context(WebKit::WebGraphicsContext3D* context3d) {
+    shared_contexts_.push_back(context3d);
+  }
+
   static const WebKit::WebGLId kExternalTextureId;
   virtual WebKit::WebGLId NextTextureId();
 
@@ -142,6 +147,7 @@ class TestWebGraphicsContext3D : public FakeWebGraphicsContext3D {
   WebGraphicsContextLostCallback* context_lost_callback_;
   std::vector<WebKit::WebGLId> textures_;
   base::hash_set<WebKit::WebGLId> used_textures_;
+  std::vector<WebKit::WebGraphicsContext3D*> shared_contexts_;
   int width_;
   int height_;
 };