Define frame subscription interface and implementation on Mac

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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/renderer_host/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 20 matching lines @@
 #include "content/browser/renderer_host/compositing_iosurface_mac.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #import "content/browser/renderer_host/render_widget_host_view_mac_editcommand_helper.h"
 #import "content/browser/renderer_host/text_input_client_mac.h"
 #include "content/common/accessibility_messages.h"
 #include "content/common/edit_command.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/plugin_messages.h"
 #include "content/common/view_messages.h"
+#include "content/port/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #import "content/public/browser/render_widget_host_view_mac_delegate.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebInputEventFactory.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebScreenInfoFactory.h"
 #import "third_party/mozilla/ComplexTextInputPanel.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 963 matching lines @@
       callback);
 }
 
 bool RenderWidgetHostViewMac::CanCopyToVideoFrame() const {
   return (!render_widget_host_->GetBackingStore(false) &&
           render_widget_host_->is_accelerated_compositing_active() &&
           compositing_iosurface_.get() &&
           compositing_iosurface_->HasIOSurface());
 }
 
+bool RenderWidgetHostViewMac::CanSubscribeFrame() const {
+  return true;
+}
+
+void RenderWidgetHostViewMac::BeginFrameSubscription(
+    RenderWidgetHostViewFrameSubscriber* subscriber) {
+  frame_subscriber_.reset(subscriber);
+}
+
+void RenderWidgetHostViewMac::EndFrameSubscription() {
+  frame_subscriber_.reset();
+}
+
 // Sets whether or not to accept first responder status.
 void RenderWidgetHostViewMac::SetTakesFocusOnlyOnMouseDown(bool flag) {
   [cocoa_view_ setTakesFocusOnlyOnMouseDown:flag];
 }
 
 void RenderWidgetHostViewMac::ForwardMouseEvent(const WebMouseEvent& event) {
   if (render_widget_host_)
     render_widget_host_->ForwardMouseEvent(event);
 
   if (event.type == WebInputEvent::MouseLeave) {
@@ skipping 93 matching lines @@
   if (window_size.IsEmpty()) {
     // setNeedsDisplay will never display and we'll never ack if the window is
     // empty, so ack now and don't bother calling setNeedsDisplay below.
     return true;
   }
 
   // No need to draw the surface if we are inside a drawRect. It will be done
   // later.
   if (!about_to_validate_and_paint_) {
     compositing_iosurface_->DrawIOSurface(cocoa_view_,
-                                          ScaleFactor(cocoa_view_));
+                                          ScaleFactor(cocoa_view_),
+                                          frame_subscriber_.get());
   }
   return true;
 }
 
 void RenderWidgetHostViewMac::AckPendingSwapBuffers() {
   TRACE_EVENT0("browser", "RenderWidgetHostViewMac::AckPendingSwapBuffers");
   while (!pending_swap_buffers_acks_.empty()) {
     if (pending_swap_buffers_acks_.front().first != 0) {
       AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
       ack_params.sync_point = 0;
@@ skipping 1305 matching lines @@
       // NSRectFill is extremely slow (15ms for a window on a fast MacPro), so
       // this is only done when it's a real invalidation from window damage (not
       // when a BuffersSwapped was received). Note that even a 1x1 NSRectFill
       // can take many milliseconds sometimes (!) so this is skipped completely
       // for drawRects that are triggered by BuffersSwapped messages.
       [[NSColor clearColor] set];
       NSRectFill(dirtyRect);
     }
 
     renderWidgetHostView_->compositing_iosurface_->DrawIOSurface(
-        self, ScaleFactor(self));
+        self, ScaleFactor(self), renderWidgetHostView_->frame_subscriber());
     return;
   }
 
   if (backingStore) {
     // Note: All coordinates are in view units, not pixels.
     gfx::Rect bitmapRect(0, 0,
                          backingStore->size().width(),
                          backingStore->size().height());
 
     // Specify the proper y offset to ensure that the view is rooted to the
@@ skipping 1033 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end