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

content/common/gpu/media/rendering_helper.cc

Index: content/common/gpu/media/rendering_helper.cc
diff --git a/content/common/gpu/media/rendering_helper.cc b/content/common/gpu/media/rendering_helper.cc
index b3bde44919047c42233976d7c63820a753885612..2a19428b2d02980cd8d56dec1b9b0b49eda01015 100644
--- a/content/common/gpu/media/rendering_helper.cc
+++ b/content/common/gpu/media/rendering_helper.cc
@@ -160,6 +160,9 @@ RenderingHelperParams::RenderingHelperParams()
     : rendering_fps(0), warm_up_iterations(0), render_as_thumbnails(false) {
 }
 
+RenderingHelperParams::RenderingHelperParams(
+    const RenderingHelperParams& other) = default;
+
 RenderingHelperParams::~RenderingHelperParams() {}
 
 VideoFrameTexture::VideoFrameTexture(uint32_t texture_target,
@@ -179,6 +182,9 @@ RenderingHelper::RenderedVideo::RenderedVideo()
     : is_flushing(false), frames_to_drop(0) {
 }
 
+RenderingHelper::RenderedVideo::RenderedVideo(const RenderedVideo& other) =
+    default;
+
 RenderingHelper::RenderedVideo::~RenderedVideo() {
 }