Make various gfx classes more amenable to use as compile-time constants.

cc/layers/picture_layer_impl_unittest.cc

 // Copyright 2013 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 <stddef.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 520 matching lines @@
         // We don't create tiles in non-invalidated regions.
         EXPECT_FALSE(iter.geometry_rect().Intersects(content_invalidation));
       }
     }
   }
 
   tilings = active_layer()->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i) {
     const PictureLayerTiling* tiling = tilings->tiling_at(i);
-    gfx::Rect content_invalidation =
-        gfx::ScaleToEnclosingRect(layer_invalidation, tiling->contents_scale());
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              tiling->contents_scale(),
              gfx::Rect(tiling->tiling_size()));
          iter;
          ++iter) {
       EXPECT_TRUE(*iter);
       EXPECT_FALSE(iter.geometry_rect().IsEmpty());
@@ skipping 1080 matching lines @@
   gfx::Size layer_bounds(400, 400);
   gfx::Rect external_viewport_for_tile_priority(400, 200);
   gfx::Rect visible_layer_rect(200, 400);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   ASSERT_EQ(1u, pending_layer()->num_tilings());
   ASSERT_EQ(1.f, pending_layer()->HighResTiling()->contents_scale());
 
   // Set external viewport for tile priority.
-  gfx::Rect viewport = gfx::Rect(layer_bounds);
   gfx::Transform transform;
   gfx::Transform transform_for_tile_priority;
   host_impl()->SetExternalTilePriorityConstraints(
       external_viewport_for_tile_priority, transform_for_tile_priority);
   host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
   host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   // Set visible content rect that is different from
   // external_viewport_for_tile_priority.
@@ skipping 3109 matching lines @@
   // New low res tiling.
   EXPECT_TRUE(tilings->tiling_at(2)->may_contain_low_resolution_tiles());
 
   // This tiling will be high res now, it won't contain low res content since it
   // was all destroyed.
   EXPECT_FALSE(tilings->tiling_at(1)->may_contain_low_resolution_tiles());
 }
 
 }  // namespace
 }  // namespace cc