[#7] Pass gfx structs by const ref (gfx::Size)

cc/output/shader.cc

 // 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.
 
 #include "cc/output/shader.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 128 matching lines @@
                                             int highp_threshold_min,
                                             gfx::Point max_coordinate) {
   return TexCoordPrecisionRequired(context,
                                    highp_threshold_cache, highp_threshold_min,
                                    max_coordinate.x(), max_coordinate.y());
 }
 
 TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
                                             int *highp_threshold_cache,
                                             int highp_threshold_min,
-                                            gfx::Size max_size) {
+                                            const gfx::Size& max_size) {
   return TexCoordPrecisionRequired(context,
                                    highp_threshold_cache, highp_threshold_min,
                                    max_size.width(), max_size.height());
 }
 
 VertexShaderPosTex::VertexShaderPosTex()
       : matrix_location_(-1) {}
 
 void VertexShaderPosTex::Init(GLES2Interface* context,
                               unsigned program,
@@ skipping 1369 matching lines @@
       vec2 texCoord =
           clamp(v_texCoord, 0.0, 1.0) * texTransform.zw + texTransform.xy;
       vec2 coord = mod(floor(texCoord * frequency * 2.0), 2.0);
       float picker = abs(coord.x - coord.y);  // NOLINT
       gl_FragColor = mix(color1, color2, picker) * alpha;
     }
   );  // NOLINT(whitespace/parens)
 }
 
 }  // namespace cc