Implement transform/clip support for Android WebView.

Transforms are applied above the root-layer.  I fixed LTHCommon to forward
root-layer transforms to sublayers, as the RenderSurface-based logic was previously
clearing transforms and copying over only the scale portion.

The clip rect is treated as the viewport for the purposes of DrawQuads and Renderer
(this is required to avoid awful performance when the WebView is much larger than
the screen).  Because y-flipping the clip rect depends on knowledge of the true
surface size, I also needed to add a new OutputSurface::SurfaceSize() getter and refactored
viewport size throughout the Renderers to separate render-pass draw rect, glViewport rect,
and surface size.

Scale and translate transforms work with this patch, but rotation is still broken.

New tests: LayerTreeHostCommonTest.TransformAboveRootLayer,
GLRendererTest2.ScissorAndViewportWithinNonreshapableSurface,
RendererPixelTest/2* and 3*

NOTRY=true
BUG=230463

Review URL: https://chromiumcodereview.appspot.com/15579002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204650 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 0 deletions

diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index d6f4b82..00877de 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -89,6 +89,7 @@ class CC_EXPORT OutputSurface {
   virtual void DiscardBackbuffer();
 
   virtual void Reshape(gfx::Size size, float scale_factor);
+  virtual gfx::Size SurfaceSize() const;
 
   virtual void BindFramebuffer();
 
@@ -110,6 +111,8 @@ class CC_EXPORT OutputSurface {
   scoped_ptr<WebKit::WebGraphicsContext3D> context3d_;
   scoped_ptr<cc::SoftwareOutputDevice> software_device_;
   bool has_gl_discard_backbuffer_;
+  gfx::Size surface_size_;
+  float device_scale_factor_;
 
   scoped_ptr<OutputSurfaceCallbacks> callbacks_;