Use RenderPass to create DrawQuad in unittests

cc/quads/render_pass.h

Index: cc/quads/render_pass.h
diff --git a/cc/quads/render_pass.h b/cc/quads/render_pass.h
index ce5a90e514d8772695c0be2d91203adfa0665795..4ca5f900870c40713dfea2f9b7ccd4c23faadd08 100644
--- a/cc/quads/render_pass.h
+++ b/cc/quads/render_pass.h
@@ -95,6 +95,13 @@ class CC_EXPORT RenderPass {
     quad_list.push_back(draw_quad.template PassAs<DrawQuad>());
     return static_cast<DrawQuadType*>(quad_list.back());
   }
+  template <typename DrawQuadType>
+  DrawQuadType* CopyFromAndAppendDrawQuad(const DrawQuadType* quad) {

[danakj, 2014/07/07 22:30:15]

Can we do two methods:

1. that takes DrawQuad* and SQS* and does DrawQuad::Copy.
2. that takes RPDrawQuad* and SQS* and RPId and does RPDrawQuad::Copy.

and then we can make those methods not allocate either now or later.

[weiliangc, 2014/07/08 21:54:38]

Done.

+    scoped_ptr<DrawQuadType> draw_quad =
+        make_scoped_ptr(new DrawQuadType(*quad));
+    quad_list.push_back(draw_quad.template PassAs<DrawQuad>());
+    return static_cast<DrawQuadType*>(quad_list.back());
+  }
 
   // Uniquely identifies the render pass in the compositor's current frame.
   Id id;