Tiling priorities in Android Webview.

Use the parent compositor's clip and transform for tile
priorities in child compositor.

When the transform matrix changes in parent compositor
(hardware_renderer.cc), it posts the matrix and the clip to
the child compositor. (The parent clip is in screen space
and the parent matrix transforms from webview space to
screen space) Child compositor will use them for tile
prioritization.

In child compositor during updating tile priority, the clip
from parent is transformed from screen space to view space, 
then from view space to content space. Then the result rect 
will intersect with content_bounds() and the intersection 
is used as tile priority input.


BUG=372073

Review URL: https://codereview.chromium.org/394113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@286731 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 4 deletions

diff --git a/cc/output/output_surface_client.h b/cc/output/output_surface_client.h
index 2c6c128..bb37a91 100644
--- a/cc/output/output_surface_client.h
+++ b/cc/output/output_surface_client.h
@@ -38,10 +38,13 @@ class CC_EXPORT OutputSurfaceClient {
   virtual void DidSwapBuffersComplete() = 0;
   virtual void ReclaimResources(const CompositorFrameAck* ack) = 0;
   virtual void DidLoseOutputSurface() = 0;
-  virtual void SetExternalDrawConstraints(const gfx::Transform& transform,
-                                          const gfx::Rect& viewport,
-                                          const gfx::Rect& clip,
-                                          bool resourceless_software_draw) = 0;
+  virtual void SetExternalDrawConstraints(
+      const gfx::Transform& transform,
+      const gfx::Rect& viewport,
+      const gfx::Rect& clip,
+      const gfx::Rect& viewport_rect_for_tile_priority,
+      const gfx::Transform& transform_for_tile_priority,
+      bool resourceless_software_draw) = 0;
   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
   // If set, |callback| will be called subsequent to each new tree activation,
   // regardless of the compositor visibility or damage. |callback| must remain