cc: Use FilterOperations::MapRect in RenderSurfaceImpl::DrawableContentRect.

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 <stddef.h>
 
 #include <algorithm>
 
@@ skipping 57 matching lines @@
 }
 
 RenderSurfaceImpl::DrawProperties::~DrawProperties() {}
 
 gfx::RectF RenderSurfaceImpl::DrawableContentRect() const {
   if (content_rect().IsEmpty())
     return gfx::RectF();
 
   gfx::Rect surface_content_rect = content_rect();
   if (!owning_layer_->filters().IsEmpty()) {
-    int left, top, right, bottom;
-    owning_layer_->filters().GetOutsets(&top, &right, &bottom, &left);
-    surface_content_rect.Inset(-left, -top, -right, -bottom);
+    const gfx::Transform& owning_layer_draw_transform =
+        owning_layer_->DrawTransform();

[jbroman, 2016/06/06 17:16:59]

using the owning layer's draw transform is how RenderSurfaceImpl::AppendQuads
computes filter scale

+    DCHECK(owning_layer_draw_transform.IsScale2d());
+    surface_content_rect = owning_layer_->filters().MapRect(
+        surface_content_rect, owning_layer_draw_transform.matrix());
   }
   gfx::RectF drawable_content_rect = MathUtil::MapClippedRect(
       draw_transform(), gfx::RectF(surface_content_rect));
   if (owning_layer_->has_replica()) {
     drawable_content_rect.Union(MathUtil::MapClippedRect(
         replica_draw_transform(), gfx::RectF(surface_content_rect)));
   } else if (!owning_layer_->filters().IsEmpty() && is_clipped()) {
     // Filter could move pixels around, but still need to be clipped.
     drawable_content_rect.Intersect(gfx::RectF(clip_rect()));
   }
@@ skipping 270 matching lines @@
   RenderPassDrawQuad* quad =
       render_pass->CreateAndAppendDrawQuad<RenderPassDrawQuad>();
   quad->SetNew(shared_quad_state, content_rect(), visible_layer_rect,
                render_pass_id, mask_resource_id, mask_uv_scale,
                mask_texture_size, owning_layer_->filters(),
                owning_layer_to_target_scale,
                owning_layer_->background_filters());
 }
 
 }  // namespace cc