Define a --force-gpu-rasterization flag

cc/trees/layer_tree_settings.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_SETTINGS_H_
 #define CC_TREES_LAYER_TREE_SETTINGS_H_
 
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/layer_tree_debug_state.h"
@@ skipping 12 matching lines @@
   bool throttle_frame_production;
   bool begin_impl_frame_scheduling_enabled;
   bool using_synchronous_renderer_compositor;
   bool per_tile_painting_enabled;
   bool partial_swap_enabled;
   bool accelerated_animation_enabled;
   bool background_color_instead_of_checkerboard;
   bool show_overdraw_in_tracing;
   bool can_use_lcd_text;
   bool should_clear_root_render_pass;
-  bool gpu_rasterization;
+  enum GpuRasterizationState {
+    GpuRasterizationDisabled,
+    GpuRasterizationEnabled,

[nduca, 2014/03/08 04:18:02]

Once you get into cc, you can use sw/hw/forced so that its clear what mode we're
in. That part of the previous review discussion seemed solid.

[ernstm, 2014/03/08 05:13:53]

In the previous review we settled on cpu/hybrid/gpu.

[ajuma, 2014/03/08 19:04:02]

Switched cc back to using cpu/hybrid/gpu.

+    GpuRasterizationForced,
+  };
+  GpuRasterizationState gpu_rasterization_state;
 
   enum ScrollbarAnimator {
     NoAnimator,
     LinearFade,
     Thinning,
   };
   ScrollbarAnimator scrollbar_animator;
   int scrollbar_linear_fade_delay_ms;
   int scrollbar_linear_fade_length_ms;
   SkColor solid_color_scrollbar_color;
@@ skipping 26 matching lines @@
   bool use_rgba_4444_textures;
   bool touch_hit_testing;
   size_t texture_id_allocation_chunk_size;
 
   LayerTreeDebugState initial_debug_state;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_