content: Add out-of-line copy ctors for complex classes.

content/common/gpu/media/rendering_helper.h

Index: content/common/gpu/media/rendering_helper.h
diff --git a/content/common/gpu/media/rendering_helper.h b/content/common/gpu/media/rendering_helper.h
index ad178f5f30b090dc1ffbb0bd413ebd422a63d6d7..250d382ac619a4fa93ec71f11998a67b3ac5f278 100644
--- a/content/common/gpu/media/rendering_helper.h
+++ b/content/common/gpu/media/rendering_helper.h
@@ -54,6 +54,7 @@ class VideoFrameTexture : public base::RefCounted<VideoFrameTexture> {
 
 struct RenderingHelperParams {
   RenderingHelperParams();
+  RenderingHelperParams(const RenderingHelperParams& other);
   ~RenderingHelperParams();
 
   // The rendering FPS.
@@ -162,6 +163,7 @@ class RenderingHelper {
     std::queue<scoped_refptr<VideoFrameTexture> > pending_frames;
 
     RenderedVideo();
+    RenderedVideo(const RenderedVideo& other);
     ~RenderedVideo();
   };