cc: Implement and use FilterOperations::MapRectReverse for mapping backdrop bounding box.

cc/output/software_renderer.cc

 // Copyright 2012 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/output/software_renderer.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 681 matching lines @@
 }
 
 gfx::Rect SoftwareRenderer::GetBackdropBoundingBoxForRenderPassQuad(
     const DrawingFrame* frame,
     const RenderPassDrawQuad* quad,
     const gfx::Transform& contents_device_transform) const {
   DCHECK(ShouldApplyBackgroundFilters(quad));
   gfx::Rect backdrop_rect = gfx::ToEnclosingRect(
       MathUtil::MapClippedRect(contents_device_transform, QuadVertexRect()));
 
-  int top, right, bottom, left;
-  quad->background_filters.GetOutsets(&top, &right, &bottom, &left);
-  backdrop_rect.Inset(-left, -top, -right, -bottom);
+  backdrop_rect =
+      quad->background_filters.MapRectReverse(backdrop_rect, SkMatrix::I());

[Stephen White, 2016/06/01 17:42:46]

And here?

 
   backdrop_rect.Intersect(MoveFromDrawToWindowSpace(
       frame, frame->current_render_pass->output_rect));
 
   return backdrop_rect;
 }
 
 sk_sp<SkShader> SoftwareRenderer::GetBackgroundFilterShader(
     const DrawingFrame* frame,
     const RenderPassDrawQuad* quad,
@@ skipping 31 matching lines @@
       ApplyImageFilter(filter.get(), quad, backdrop_bitmap, nullptr);
 
   if (!filter_backdrop_image)
     return nullptr;
 
   return filter_backdrop_image->makeShader(content_tile_mode, content_tile_mode,
                                            &filter_backdrop_transform);
 }
 
 }  // namespace cc