Add flag for drawing layers to screen with Ganesh

cc/test/pixel_test.h

Index: cc/test/pixel_test.h
diff --git a/cc/test/pixel_test.h b/cc/test/pixel_test.h
index 148ecf939ecaadf28a94fb74ec3f4ff308ccdfc5..c7dd7aaf94824f5a6d34de3e4c0fbc30909d865c 100644
--- a/cc/test/pixel_test.h
+++ b/cc/test/pixel_test.h
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/file_util.h"
+#include "cc/output/gl_renderer.h"
 #include "cc/quads/render_pass.h"
 #include "cc/test/pixel_comparator.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -13,7 +14,6 @@
 
 namespace cc {
 class DirectRenderer;
-class GLRenderer;
 class SoftwareRenderer;
 class OutputSurface;
 class ResourceProvider;
@@ -40,7 +40,7 @@ class PixelTest : public testing::Test {
   scoped_ptr<DirectRenderer> renderer_;
   scoped_ptr<SkBitmap> result_bitmap_;
 
-  void SetUpGLRenderer();
+  void SetUpGLRenderer(bool use_skia_gpu_backend);
   void SetUpSoftwareRenderer();
 
  private:
@@ -57,13 +57,47 @@ class RendererPixelTest : public PixelTest {
     return static_cast<RendererType*>(renderer_.get());
   }
 
+  bool UseSkiaGPUBackend() const;
+
  protected:
   virtual void SetUp() OVERRIDE;
 };
 
+// A simple wrapper to differentiate a renderer that should use ganesh
+// and one that shouldn't in templates.
+class GLRendererWithSkiaGPUBackend : public GLRenderer {
+ public:
+  GLRendererWithSkiaGPUBackend(RendererClient* client,
+                       OutputSurface* output_surface,
+                       ResourceProvider* resource_provider,
+                       int highp_threshold_min)
+      : GLRenderer(client,
+                   output_surface,
+                   resource_provider,
+                   highp_threshold_min) {}
+};
+
 template<>
 inline void RendererPixelTest<GLRenderer>::SetUp() {
-  SetUpGLRenderer();
+  SetUpGLRenderer(false);
+  DCHECK(!renderer()->CanUseSkiaGPUBackend());
+}
+
+template<>
+inline bool RendererPixelTest<GLRenderer>::UseSkiaGPUBackend() const {
+  return false;
+}
+
+template<>
+inline void RendererPixelTest<GLRendererWithSkiaGPUBackend>::SetUp() {
+  SetUpGLRenderer(true);
+  DCHECK(renderer()->CanUseSkiaGPUBackend());
+}
+
+template <>
+inline bool
+RendererPixelTest<GLRendererWithSkiaGPUBackend>::UseSkiaGPUBackend() const {
+  return true;
 }
 
 template<>
@@ -71,7 +105,14 @@ inline void RendererPixelTest<SoftwareRenderer>::SetUp() {
   SetUpSoftwareRenderer();
 }
 
+template<>
+inline bool RendererPixelTest<SoftwareRenderer>::UseSkiaGPUBackend() const {
+  return false;
+}
+
 typedef RendererPixelTest<GLRenderer> GLRendererPixelTest;
+typedef RendererPixelTest<GLRendererWithSkiaGPUBackend>
+    GLRendererSkiaGPUBackendPixelTest;
 typedef RendererPixelTest<SoftwareRenderer> SoftwareRendererPixelTest;
 
 }  // namespace cc