[#8] Pass gfx::Point by const ref.

cc/output/shader.h

Index: cc/output/shader.h
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 8b2a5d9bbafb390d38f49dc677b0e1aa8f2c8cb1..36430cc6cfbce2d18b212d3d184519816cb0be45 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -43,11 +43,11 @@ enum SamplerType {
 // the caching multi-thread/context safe in an easy low-overhead manner.
 // The caller must make sure to clear highp_threshold_cache to 0, so it can be
 // reinitialized, if a new or different context is used.
-CC_EXPORT TexCoordPrecision TexCoordPrecisionRequired(
-    gpu::gles2::GLES2Interface* context,
-    int *highp_threshold_cache,
-    int highp_threshold_min,
-    gfx::Point max_coordinate);
+CC_EXPORT TexCoordPrecision
+    TexCoordPrecisionRequired(gpu::gles2::GLES2Interface* context,
+                              int* highp_threshold_cache,
+                              int highp_threshold_min,
+                              const gfx::Point& max_coordinate);
 
 CC_EXPORT TexCoordPrecision TexCoordPrecisionRequired(
     gpu::gles2::GLES2Interface* context,