cc: Implement overdraw feedback debugging feature.

cc/output/renderer_pixeltest.cc

Index: cc/output/renderer_pixeltest.cc
diff --git a/cc/output/renderer_pixeltest.cc b/cc/output/renderer_pixeltest.cc
index d9decc1c7b59abf34739d5444277c6e27d800ac2..af03b59daceae83a6238373fc0020cf83c4669d5 100644
--- a/cc/output/renderer_pixeltest.cc
+++ b/cc/output/renderer_pixeltest.cc
@@ -2195,7 +2195,8 @@ class ExternalStencilPixelTest : public GLRendererPixelTest {
   void ClearBackgroundToGreen() {
     GLES2Interface* gl = output_surface_->context_provider()->ContextGL();
     output_surface_->EnsureBackbuffer();
-    output_surface_->Reshape(device_viewport_size_, 1, gfx::ColorSpace(), true);
+    output_surface_->Reshape(device_viewport_size_, 1, gfx::ColorSpace(), true,
+                             false);
     gl->ClearColor(0.f, 1.f, 0.f, 1.f);
     gl->Clear(GL_COLOR_BUFFER_BIT);
   }
@@ -2204,7 +2205,8 @@ class ExternalStencilPixelTest : public GLRendererPixelTest {
     // Set two quadrants of the stencil buffer to 1.
     GLES2Interface* gl = output_surface_->context_provider()->ContextGL();
     output_surface_->EnsureBackbuffer();
-    output_surface_->Reshape(device_viewport_size_, 1, gfx::ColorSpace(), true);
+    output_surface_->Reshape(device_viewport_size_, 1, gfx::ColorSpace(), true,
+                             false);
     gl->ClearStencil(0);
     gl->Clear(GL_STENCIL_BUFFER_BIT);
     gl->Enable(GL_SCISSOR_TEST);