Implement hidpi and pinch-zoom scaling of filter params in cc.

cc/layers/render_surface_impl.cc

 // Copyright 2011 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/layers/render_surface_impl.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
@@ skipping 197 matching lines @@
         uv_scale_x,
         uv_scale_y);
   }
 
   ResourceProvider::ResourceId mask_resource_id =
       mask_layer ? mask_layer->ContentsResourceId() : 0;
   gfx::Rect contents_changed_since_last_frame =
       ContentsChanged() ? content_rect_ : gfx::Rect();
 
   scoped_ptr<RenderPassDrawQuad> quad = RenderPassDrawQuad::Create();
+  gfx::Transform scale =
+      owning_layer_->draw_properties().target_space_transform;

[danakj, 2014/03/07 17:35:44]

Invert the order here.

Transform Scale() should happen first, then PreConcat the
target_space_transform.

[Stephen White, 2014/03/07 20:45:58]

Done (probably shouldn't make a difference if it really is just a scale, but
ok).

+  scale.Scale(owning_layer_->contents_scale_x(),
+              owning_layer_->contents_scale_y());
   quad->SetNew(shared_quad_state,
                content_rect_,
                render_pass_id,
                for_replica,
                mask_resource_id,
                contents_changed_since_last_frame,
                mask_uv_rect,
                owning_layer_->filters(),
-               owning_layer_->background_filters());
+               owning_layer_->background_filters(),
+               scale);
   quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
 }
 
 }  // namespace cc