cast: support cursor rendering for tab capture

content/browser/compositor/delegated_frame_host.cc

Index: content/browser/compositor/delegated_frame_host.cc
diff --git a/content/browser/compositor/delegated_frame_host.cc b/content/browser/compositor/delegated_frame_host.cc
index ca8a0d87168a43ce8f8d8e46dcc3a33eacda20f6..9bab72b1e94153d80cf60f1d513ce00e1cc6ba42 100644
--- a/content/browser/compositor/delegated_frame_host.cc
+++ b/content/browser/compositor/delegated_frame_host.cc
@@ -4,6 +4,10 @@
 
 #include "content/browser/compositor/delegated_frame_host.h"
 
+#include <algorithm>
+#include <string>
+#include <vector>
+
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/time/default_tick_clock.h"
@@ -154,11 +158,11 @@ void DelegatedFrameHost::CopyFromCompositingSurface(
 }
 
 void DelegatedFrameHost::CopyFromCompositingSurfaceToVideoFrame(
-      const gfx::Rect& src_subrect,
-      const scoped_refptr<media::VideoFrame>& target,
-      const base::Callback<void(bool)>& callback) {
+    const gfx::Rect& src_subrect,
+    const scoped_refptr<media::VideoFrame>& target,
+    const base::Callback<void(gfx::Rect, bool)>& callback) {
   if (!CanCopyToVideoFrame()) {
-    callback.Run(false);
+    callback.Run(gfx::Rect(), false);
     return;
   }
 
@@ -769,9 +773,10 @@ void DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo(
     base::WeakPtr<DelegatedFrameHost> dfh,
     scoped_refptr<OwnedMailbox> subscriber_texture,
     scoped_refptr<media::VideoFrame> video_frame,
-    const base::Callback<void(bool)>& callback,
+    const base::Callback<void(gfx::Rect, bool)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
-  base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
+  base::ScopedClosureRunner scoped_callback_runner(
+      base::Bind(callback, gfx::Rect(), false));
   base::ScopedClosureRunner scoped_return_subscriber_texture(
       base::Bind(&ReturnSubscriberTexture, dfh, subscriber_texture, 0));
 
@@ -822,7 +827,7 @@ void DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo(
           video_frame.get());
     }
     ignore_result(scoped_callback_runner.Release());
-    callback.Run(true);
+    callback.Run(region_in_frame, true);
     return;
   }
 
@@ -875,12 +880,11 @@ void DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo(
 
   ignore_result(scoped_callback_runner.Release());
   ignore_result(scoped_return_subscriber_texture.Release());
+
   base::Callback<void(bool result)> finished_callback = base::Bind(
       &DelegatedFrameHost::CopyFromCompositingSurfaceFinishedForVideo,
-      dfh->AsWeakPtr(),
-      callback,
-      subscriber_texture,
-      base::Passed(&release_callback));
+      dfh->AsWeakPtr(), base::Bind(callback, region_in_frame),
+      subscriber_texture, base::Passed(&release_callback));
   yuv_readback_pipeline->ReadbackYUV(texture_mailbox.mailbox(),
                                      texture_mailbox.sync_point(),
                                      video_frame.get(),