Fix UpdateTilePriorities viewport in Android WebView.

cc/output/software_renderer_unittest.cc

Index: cc/output/software_renderer_unittest.cc
diff --git a/cc/output/software_renderer_unittest.cc b/cc/output/software_renderer_unittest.cc
index ba1a0da1f162a55a2a251a5ad22caf543de4645c..6125fb6918facd02e90615f79301d16220e029b0 100644
--- a/cc/output/software_renderer_unittest.cc
+++ b/cc/output/software_renderer_unittest.cc
@@ -58,6 +58,9 @@ class SoftwareRendererTest : public testing::Test, public RendererClient {
   virtual gfx::Rect DeviceViewport() const OVERRIDE {
     return viewport_;
   }
+  virtual gfx::Rect DeviceClip() const OVERRIDE {
+    return DeviceViewport();
+  }
   virtual float DeviceScaleFactor() const OVERRIDE {
     return 1.f;
   }