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

cc/cc_tests.gyp

 # Copyright (c) 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_unit_tests_source_files': [
       'animation/animation_unittest.cc',
       'layers/content_layer_unittest.cc',
       'layers/contents_scaling_layer_unittest.cc',
       'trees/damage_tracker_unittest.cc',
       'scheduler/delay_based_time_source_unittest.cc',
       'layers/delegated_renderer_layer_impl_unittest.cc',
       'output/delegating_renderer_unittest.cc',
       'quads/draw_quad_unittest.cc',
       'base/float_quad_unittest.cc',
       'scheduler/frame_rate_controller_unittest.cc',
       'output/gl_renderer_unittest.cc',
       'output/gl_renderer_pixeltest.cc',
+      'output/shader_unittest.cc',
       'base/hash_pair_unittest.cc',
       'layers/heads_up_display_unittest.cc',
       'animation/keyframed_animation_curve_unittest.cc',
       'animation/layer_animation_controller_unittest.cc',
       'layers/layer_impl_unittest.cc',
       'layers/layer_iterator_unittest.cc',
       'resources/layer_quad_unittest.cc',
       'trees/layer_sorter_unittest.cc',
       'trees/layer_tree_host_common_unittest.cc',
       'trees/layer_tree_host_impl_unittest.cc',
@@ skipping 262 matching lines @@
           'variables': {
             'test_suite_name': 'cc_perftests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)cc_perftests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }]
   ],
 }