Fix UpdateTilePriorities viewport in Android WebView.

cc/output/direct_renderer.h

Index: cc/output/direct_renderer.h
diff --git a/cc/output/direct_renderer.h b/cc/output/direct_renderer.h
index 504eaeff3b046c10c562715d0dcf47670be2b97a..3937619b38d93a40f2272c7b7cc7ec09c275485f 100644
--- a/cc/output/direct_renderer.h
+++ b/cc/output/direct_renderer.h
@@ -89,6 +89,8 @@ class CC_EXPORT DirectRenderer : public Renderer {
                           gfx::Size surface_size);
   gfx::Rect MoveFromDrawToWindowSpace(const gfx::RectF& draw_rect) const;
 
+  bool NeedDeviceClip(const DrawingFrame* frame) const;
+  gfx::Rect DeviceClipRect(const DrawingFrame* frame) const;
   static gfx::RectF ComputeScissorRectForRenderPass(const DrawingFrame* frame);
   void SetScissorStateForQuad(const DrawingFrame* frame, const DrawQuad& quad);
   void SetScissorStateForQuadWithRenderPassScissor(
@@ -96,6 +98,8 @@ class CC_EXPORT DirectRenderer : public Renderer {
       const DrawQuad& quad,
       const gfx::RectF& render_pass_scissor,
       bool* should_skip_quad);
+  void SetScissorTestRectInDrawSpace(const DrawingFrame* frame,
+                                     gfx::RectF draw_space_rect);
 
   static gfx::Size RenderPassTextureSize(const RenderPass* render_pass);
   static GLenum RenderPassTextureFormat(const RenderPass* render_pass);