Canvas capture from inactive tab

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 649 matching lines @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_HideValidationMessage,
                         OnHideValidationMessage)
     IPC_MESSAGE_HANDLER(ViewHostMsg_MoveValidationMessage,
                         OnMoveValidationMessage)
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(FrameHostMsg_FindMatchRects_Reply,
                         OnFindMatchRectsReply)
     IPC_MESSAGE_HANDLER(ViewHostMsg_OpenDateTimeDialog,
                         OnOpenDateTimeDialog)
 #endif
+    IPC_MESSAGE_HANDLER(FrameHostMsg_IncrementCapturerCount,
+                        OnIncrementCapturerCount)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_DecrementCapturerCount,
+                        OnDecrementCapturerCount)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   render_view_message_source_ = NULL;
   render_frame_message_source_ = NULL;
 
   return handled;
 }
 
 bool WebContentsImpl::HasValidFrameSource() {
   if (!render_frame_message_source_) {
@@ skipping 1525 matching lines @@
   if (delegate_)
     delegate_->HideValidationMessage(this);
 }
 
 void WebContentsImpl::OnMoveValidationMessage(
     const gfx::Rect& anchor_in_root_view) {
   if (delegate_)
     delegate_->MoveValidationMessage(this, anchor_in_root_view);
 }
 
+void WebContentsImpl::OnIncrementCapturerCount() {
+  DVLOG(3) << __FUNCTION__;
+  IncrementCapturerCount(gfx::Size());
+}
+
+void WebContentsImpl::OnDecrementCapturerCount() {
+  DVLOG(3) << __FUNCTION__;
+  DecrementCapturerCount();
+}
+
 void WebContentsImpl::DidSendScreenRects(RenderWidgetHostImpl* rwh) {
   if (browser_plugin_embedder_)
     browser_plugin_embedder_->DidSendScreenRects();
 }
 
 BrowserAccessibilityManager*
     WebContentsImpl::GetRootBrowserAccessibilityManager() {
   RenderFrameHostImpl* rfh = GetMainFrame();
   return rfh ? rfh->browser_accessibility_manager() : nullptr;
 }
@@ skipping 2526 matching lines @@
     const WebContentsObserver::MediaPlayerId& id) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStartedPlaying(id));
 }
 
 void WebContentsImpl::MediaStoppedPlaying(
     const WebContentsObserver::MediaPlayerId& id) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStoppedPlaying(id));
 }
 
 }  // namespace content