cc: Use highp precision for texture coords if available and needed

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 38 matching lines @@
   double refresh_rate;
   size_t max_partial_texture_updates;
   size_t num_raster_threads;
   gfx::Size default_tile_size;
   gfx::Size max_untiled_layer_size;
   gfx::Size minimum_occlusion_tracking_size;
   bool use_pinch_zoom_scrollbars;
   size_t max_prepaint_tile_distance;
   size_t max_tiles_for_interest_area;
   size_t max_unused_resource_memory_percentage;
+  int highp_threshold_min;
 
   LayerTreeDebugState initial_debug_state;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_