color: Add support for shader generation

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index ea73b6f881e7d7958bedf7afcb51bf3141c0340f..2a0ce1c5e849757b6c803628ba52b1f4102a4f7d 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -298,6 +298,12 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   std::unordered_map<ProgramKey, std::unique_ptr<Program>, ProgramKeyHash>
       program_cache_;
 
+  const gfx::ColorTransform* GetColorTransform(const gfx::ColorSpace& src,
+                                               const gfx::ColorSpace& dst);
+  std::map<gfx::ColorSpace,
+           std::map<gfx::ColorSpace, std::unique_ptr<gfx::ColorTransform>>>
+      color_transform_cache_;
+
   gpu::gles2::GLES2Interface* gl_;
   gpu::ContextSupport* context_support_;
   std::unique_ptr<ContextCacheController::ScopedVisibility> context_visibility_;