Implement transform/clip support for Android WebView.

cc/output/software_renderer.cc

Index: cc/output/software_renderer.cc
diff --git a/cc/output/software_renderer.cc b/cc/output/software_renderer.cc
index 3906ea865ec0edc4e5c4b5107f6afa90a45193d0..fa58c1808fee00cb8347e2400c2ba803470f2b26 100644
--- a/cc/output/software_renderer.cc
+++ b/cc/output/software_renderer.cc
@@ -151,8 +151,8 @@ bool SoftwareRenderer::BindFramebufferToTexture(
       new ResourceProvider::ScopedWriteLockSoftware(
           resource_provider_, texture->id()));
   current_canvas_ = current_framebuffer_lock_->sk_canvas();
-  InitializeMatrices(frame, framebuffer_rect, false);
-  SetDrawViewportSize(framebuffer_rect.size());
+  InitializeMatrices(frame, gfx::Vector2d(), framebuffer_rect, false);
+  SetDrawViewport(gfx::Rect(framebuffer_rect.size()));
 
   return true;
 }
@@ -192,7 +192,7 @@ void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame) {
   }
 }
 
-void SoftwareRenderer::SetDrawViewportSize(gfx::Size viewport_size) {}
+void SoftwareRenderer::SetDrawViewport(gfx::Rect viewport) {}
 
 bool SoftwareRenderer::IsSoftwareResource(
     ResourceProvider::ResourceId resource_id) const {