cc: Don't analyze masks for solid color.

cc/layers/picture_layer_impl.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/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 564 matching lines @@
 
 skia::RefPtr<SkPicture> PictureLayerImpl::GetPicture() {
   return pile_->GetFlattenedPicture();
 }
 
 scoped_refptr<Tile> PictureLayerImpl::CreateTile(PictureLayerTiling* tiling,
                                                const gfx::Rect& content_rect) {
   if (!pile_->CanRaster(tiling->contents_scale(), content_rect))
     return scoped_refptr<Tile>();
 
+  int flags = 0;
+
   // TODO(vmpstr): Revisit this. For now, enabling analysis means that we get as
   // much savings on memory as we can. However, for some cases like ganesh or
   // small layers, the amount of time we spend analyzing might not justify
-  // memory savings that we can get.
+  // memory savings that we can get. Note that we don't handle solid color
+  // masks, so we shouldn't bother analyzing those.
   // Bugs: crbug.com/397198, crbug.com/396908
-  int flags = Tile::USE_PICTURE_ANALYSIS;
+  if (!is_mask_)
+    flags = Tile::USE_PICTURE_ANALYSIS;
 
   return layer_tree_impl()->tile_manager()->CreateTile(
       pile_.get(),
       content_rect.size(),
       content_rect,
       contents_opaque() ? content_rect : gfx::Rect(),
       tiling->contents_scale(),
       id(),
       layer_tree_impl()->source_frame_number(),
       flags);
@@ skipping 1168 matching lines @@
       PictureLayerTilingSet::TilingRange tiling_range = CurrentTilingRange();
       size_t current_tiling_range_offset = current_tiling_ - tiling_range.start;
       return tiling_range.end - 1 - current_tiling_range_offset;
     }
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace cc