Fix UpdateTilePriorities viewport in Android WebView.

cc/output/software_renderer_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/software_renderer.h"
 
 #include "cc/layers/quad_sink.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/software_output_device.h"
 #include "cc/quads/render_pass.h"
@@ skipping 40 matching lines @@
   }
 
   void set_should_clear_root_render_pass(bool clear_root_render_pass) {
     should_clear_root_render_pass_ = clear_root_render_pass;
   }
 
   // RendererClient implementation.
   virtual gfx::Rect DeviceViewport() const OVERRIDE {
     return viewport_;
   }
+  virtual gfx::Rect DeviceClip() const OVERRIDE {
+    return DeviceViewport();
+  }
   virtual float DeviceScaleFactor() const OVERRIDE {
     return 1.f;
   }
   virtual const LayerTreeSettings& Settings() const OVERRIDE {
     return settings_;
   }
   virtual void SetFullRootLayerDamage() OVERRIDE {}
   virtual bool HasImplThread() const OVERRIDE { return false; }
   virtual bool ShouldClearRootRenderPass() const OVERRIDE {
     return should_clear_root_render_pass_;
@@ skipping 330 matching lines @@
   EXPECT_EQ(
       SK_ColorMAGENTA,
       output.getColor(interior_visible_rect.x(), interior_visible_rect.y()));
   EXPECT_EQ(SK_ColorMAGENTA,
             output.getColor(interior_visible_rect.right() - 1,
                             interior_visible_rect.bottom() - 1));
 }
 
 }  // namespace
 }  // namespace cc