Implement TextureImageTransportSurface using texture mailbox

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 9af6457c37416647d7b5d03bbf10f2608d92d12a..4853fdd4bf24b624dc06d71b60b53a4fffd5e4e4 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -45,7 +45,6 @@
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ui_base_types.h"
-#include "ui/compositor/compositor.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/display.h"
@@ -57,6 +56,9 @@
 #include "ui/base/win/hidden_window.h"
 #endif
 
+using gfx::RectToSkIRect;
+using gfx::SkIRectToRect;
+
 using WebKit::WebScreenInfo;
 using WebKit::WebTouchEvent;
 
@@ -263,6 +265,18 @@ class RenderWidgetHostViewAura::ResizeLock {
   DISALLOW_COPY_AND_ASSIGN(ResizeLock);
 };
 
+RenderWidgetHostViewAura::BufferPresentedParams::BufferPresentedParams(
+    int route_id,
+    int gpu_host_id,
+    uint64 surface_handle)
+    : route_id(route_id),
+      gpu_host_id(gpu_host_id),
+      surface_handle(surface_handle) {
+}
+
+RenderWidgetHostViewAura::BufferPresentedParams::~BufferPresentedParams() {
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, public:
 
@@ -279,10 +293,6 @@ RenderWidgetHostViewAura::RenderWidgetHostViewAura(RenderWidgetHost* host)
       has_composition_text_(false),
       device_scale_factor_(1.0f),
       current_surface_(0),
-      current_surface_is_protected_(true),
-      current_surface_in_use_by_compositor_(true),
-      protection_state_id_(0),
-      surface_route_id_(0),
       paint_canvas_(NULL),
       synthetic_move_sent_(false),
       accelerated_compositing_state_changed_(false),
@@ -382,8 +392,6 @@ void RenderWidgetHostViewAura::WasShown() {
     released_front_lock_ = GetCompositor()->GetCompositorLock();
   }
 
-  AdjustSurfaceProtection();
-
 #if defined(OS_WIN)
   LPARAM lparam = reinterpret_cast<LPARAM>(this);
   EnumChildWindows(ui::GetHiddenWindow(), ShowWindowsCallback, lparam);
@@ -397,14 +405,6 @@ void RenderWidgetHostViewAura::WasHidden() {
 
   released_front_lock_ = NULL;
 
-  if (ShouldReleaseFrontSurface() &&
-      host_->is_accelerated_compositing_active()) {
-    current_surface_ = 0;
-    UpdateExternalTexture();
-  }
-
-  AdjustSurfaceProtection();
-
 #if defined(OS_WIN)
   aura::RootWindow* root_window = window_->GetRootWindow();
   if (root_window) {
@@ -711,7 +711,7 @@ void RenderWidgetHostViewAura::CopyFromCompositingSurface(
       output->GetBitmap().getPixels());
   scoped_callback_runner.Release();
   // Wrap the callback with an internal handler so that we can inject our
-  // own completion handlers (where we can call AdjustSurfaceProtection).
+  // own completion handlers (where we can try to free the frontbuffer).
   base::Callback<void(bool)> wrapper_callback = base::Bind(
       &RenderWidgetHostViewAura::CopyFromCompositingSurfaceFinished,
       AsWeakPtr(),
@@ -744,16 +744,13 @@ void RenderWidgetHostViewAura::OnAcceleratedCompositingStateChange() {
   accelerated_compositing_state_changed_ = true;
 }
 
-bool RenderWidgetHostViewAura::ShouldFastACK(uint64 surface_id) {
-  ui::Texture* container = image_transport_clients_[surface_id];
-  DCHECK(container);
-
+bool RenderWidgetHostViewAura::ShouldSkipFrame(const gfx::Size& size) {
   if (can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
       can_lock_compositor_ == NO_PENDING_COMMIT ||
       resize_locks_.empty())
     return false;
 
-  gfx::Size container_size = ConvertSizeToDIP(this, container->size());
+  gfx::Size container_size = ConvertSizeToDIP(this, size);
   ResizeLockList::iterator it = resize_locks_.begin();
   while (it != resize_locks_.end()) {
     if ((*it)->expected_size() == container_size)
@@ -776,7 +773,6 @@ void RenderWidgetHostViewAura::UpdateExternalTexture() {
   if (current_surface_ != 0 && host_->is_accelerated_compositing_active()) {
     ui::Texture* container = image_transport_clients_[current_surface_];
     window_->SetExternalTexture(container);
-    current_surface_in_use_by_compositor_ = true;
 
     if (!container) {
       resize_locks_.clear();
@@ -812,120 +808,135 @@ void RenderWidgetHostViewAura::UpdateExternalTexture() {
     }
   } else {
     window_->SetExternalTexture(NULL);
-    if (ShouldReleaseFrontSurface() &&
-        host_->is_accelerated_compositing_active()) {
-      // We need to wait for a commit to clear to guarantee that all we
-      // will not issue any more GL referencing the previous surface.
-      ui::Compositor* compositor = GetCompositor();
-      if (compositor) {
-        can_lock_compositor_ = NO_PENDING_COMMIT;
-        on_compositing_did_commit_callbacks_.push_back(
-            base::Bind(&RenderWidgetHostViewAura::
-                           SetSurfaceNotInUseByCompositor,
-                       AsWeakPtr()));
-        if (!compositor->HasObserver(this))
-          compositor->AddObserver(this);
-      }
-    }
     resize_locks_.clear();
   }
 }
 
-void RenderWidgetHostViewAura::AcceleratedSurfaceBuffersSwapped(
-    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params_in_pixel,
-    int gpu_host_id) {
-  surface_route_id_ = params_in_pixel.route_id;
-  // If protection state changed, then this swap is stale. We must still ACK but
-  // do not update current_surface_ since it may have been discarded.
-  if (params_in_pixel.protection_state_id &&
-      params_in_pixel.protection_state_id != protection_state_id_) {
-    DCHECK(!current_surface_);
-    if (!params_in_pixel.skip_ack)
-      InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, false, NULL);
-    return;
+bool RenderWidgetHostViewAura::SwapBuffersPrepare(
+    const gfx::Rect& surface_rect,
+    const gfx::Rect& damage_rect,
+    BufferPresentedParams& params) {

[piman, 2012/11/30 03:54:32]

nit: style says no non-const reference as parameter (use a pointer).

+  DCHECK(params.surface_handle);
+  DCHECK(!params.texture_to_produce);
+
+  if (previous_surface_size_ != surface_rect.size()) {
+    // The surface could have shrunk since we skipped an update, in which
+    // case we can expect a full update.
+    DLOG_IF(ERROR, damage_rect != surface_rect) << "Expected full damage rect";
+    skipped_damage_.setEmpty();

[jonathan.backer, 2012/11/20 21:21:11]

I like the idea of the sanity check, but we're not using
|previous_surface_size_| anywhere else. I noticed that we're doing a similar
check on |AcceleratedSurfacePostSubBuffers|. Maybe drop this?

[no sievers, 2012/12/01 00:58:38]

But I do want to reset the skipped_damage_ here.
The main problem is that it causes real errors if I use a rect too large after
the surface shrunk during the damage copy.
I think I also had it clip it to the surface size at some point, but for reasons
I don't remember exactly ended up keeping the skipped_damage_ precise here.

+    previous_surface_size_ = surface_rect.size();
   }
 
-  if (ShouldFastACK(params_in_pixel.surface_handle)) {
-    if (!params_in_pixel.skip_ack)
-      InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, false, NULL);
-    return;
+  if (ShouldSkipFrame(surface_rect.size()) || !GetCompositor()) {

[piman, 2012/11/30 03:54:32]

As mentioned before, even if we don't have a compositor (e.g. if we're not in
the tree) we should keep the frame that was given, so that we can display it
when we get it back.

[no sievers, 2012/12/01 00:58:38]

Ok, so I've changed it to *not* do the fast ack here if there is no compositor,
and also do the damage copy, but do not schedule a paint. Is that good?

[piman, 2012/12/03 21:08:43]

Yep, great.

+    skipped_damage_.op(RectToSkIRect(damage_rect), SkRegion::kUnion_Op);
+    InsertSyncPointAndACK(params);
+    return false;
   }
 
-  current_surface_ = params_in_pixel.surface_handle;
-  // If we don't require an ACK that means the content is not a fresh updated
-  // new frame, rather we are just resetting our handle to some old content
-  // that we still hadn't discarded. Although we could display immediately,
-  // by not resetting the compositor lock here, we give us some time to get
-  // a fresh frame which means fewer content flashes.
-  if (!params_in_pixel.skip_ack)
-    released_front_lock_ = NULL;
+  const uint64 previous_surface = current_surface_;
+  DCHECK(!previous_surface || image_transport_clients_.find(previous_surface) !=
+      image_transport_clients_.end());
+  if (previous_surface)
+    params.texture_to_produce = image_transport_clients_[previous_surface];
+
+  current_surface_ = params.surface_handle;
+  params.surface_handle = previous_surface;

[piman, 2012/11/30 03:54:32]

nit: how about std::swap?

 
+  DCHECK(image_transport_clients_.find(current_surface_) !=
+      image_transport_clients_.end());
+
+  image_transport_clients_[current_surface_]->Consume(surface_rect.size());
+  released_front_lock_ = NULL;
   UpdateExternalTexture();
 
+  return true;
+}
+
+void RenderWidgetHostViewAura::SwapBuffersCompleted(
+    const BufferPresentedParams& params) {
   ui::Compositor* compositor = GetCompositor();
   if (!compositor) {
-    if (!params_in_pixel.skip_ack)
-      InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, true, NULL);
+    InsertSyncPointAndACK(params);
   } else {
-    DCHECK(image_transport_clients_.find(params_in_pixel.surface_handle) !=
-           image_transport_clients_.end());
-    gfx::Size surface_size_in_pixel =
-        image_transport_clients_[params_in_pixel.surface_handle]->size();
-    gfx::Size surface_size = ConvertSizeToDIP(this, surface_size_in_pixel);
-    window_->SchedulePaintInRect(gfx::Rect(surface_size));
+    // Add sending an ACK to the list of things to do OnCompositingDidCommit
+    can_lock_compositor_ = NO_PENDING_COMMIT;
+    on_compositing_did_commit_callbacks_.push_back(
+        base::Bind(&RenderWidgetHostViewAura::InsertSyncPointAndACK, params));
+    if (!compositor->HasObserver(this))
+      compositor->AddObserver(this);
+  }
+}
 
-    if (!params_in_pixel.skip_ack) {
-      // Add sending an ACK to the list of things to do OnCompositingDidCommit
-      can_lock_compositor_ = NO_PENDING_COMMIT;
-      on_compositing_did_commit_callbacks_.push_back(
-          base::Bind(&RenderWidgetHostViewAura::InsertSyncPointAndACK,
-                     params_in_pixel.route_id,
-                     gpu_host_id,
-                     true));
-      if (!compositor->HasObserver(this))
-        compositor->AddObserver(this);
-    }
+void RenderWidgetHostViewAura::AcceleratedSurfaceBuffersSwapped(
+    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params_in_pixel,
+    int gpu_host_id) {
+  const gfx::Rect surface_rect = gfx::Rect(gfx::Point(), params_in_pixel.size);
+  BufferPresentedParams ack_params(
+      params_in_pixel.route_id, gpu_host_id, params_in_pixel.surface_handle);
+  if (!SwapBuffersPrepare(surface_rect, surface_rect, ack_params))
+    return;
+
+  previous_damage_.setRect(RectToSkIRect(surface_rect));
+  skipped_damage_.setEmpty();
+
+  ui::Compositor* compositor = GetCompositor();

[jonathan.backer, 2012/11/20 21:21:11]

Don't we know we have a compositor here? If not |SwapBuffersPrepare| would have
returned false and we would have bailed earlier.

[no sievers, 2012/12/01 00:58:38]

Since I changed it in the latest patch to copy the damage still, we could have
one now.

+  if (compositor) {
+    gfx::Size surface_size = ConvertSizeToDIP(this, params_in_pixel.size);
+    window_->SchedulePaintInRect(gfx::Rect(surface_size));
   }
+
+  SwapBuffersCompleted(ack_params);
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
     const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params_in_pixel,
     int gpu_host_id) {
-  surface_route_id_ = params_in_pixel.route_id;
-  // If visible state changed, then this PSB is stale. We must still ACK but
-  // do not update current_surface_.
-  if (params_in_pixel.protection_state_id &&
-      params_in_pixel.protection_state_id != protection_state_id_) {
-    DCHECK(!current_surface_);
-    InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, false, NULL);
+  const gfx::Rect surface_rect =
+      gfx::Rect(gfx::Point(), params_in_pixel.surface_size);
+  gfx::Rect damage_rect(params_in_pixel.x,
+                        params_in_pixel.y,
+                        params_in_pixel.width,
+                        params_in_pixel.height);
+  BufferPresentedParams ack_params(
+      params_in_pixel.route_id, gpu_host_id, params_in_pixel.surface_handle);
+  if (!SwapBuffersPrepare(surface_rect, damage_rect, ack_params))
     return;
-  }
 
-  if (ShouldFastACK(params_in_pixel.surface_handle)) {
-    InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, false, NULL);
-    return;
+  SkRegion damage(RectToSkIRect(damage_rect));
+  if (!skipped_damage_.isEmpty()) {
+    damage.op(skipped_damage_, SkRegion::kUnion_Op);
+    damage_rect = gfx::SkIRectToRect(damage.getBounds());

[jonathan.backer, 2012/11/20 21:21:11]

Why reset |damage_rect|? Just for the following DCHECK?

+    skipped_damage_.setEmpty();
   }
 
-  current_surface_ = params_in_pixel.surface_handle;
-  released_front_lock_ = NULL;
-  DCHECK(current_surface_);
-  UpdateExternalTexture();
+  DCHECK(surface_rect.Contains(damage_rect));
+  ui::Texture* current_texture = image_transport_clients_[current_surface_];
 
   ui::Compositor* compositor = GetCompositor();

[jonathan.backer, 2012/11/20 21:21:11]

Same as above. We know that we have a compositor here.

-  if (!compositor) {
-    InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, true, NULL);
-  } else {
-    DCHECK(image_transport_clients_.find(params_in_pixel.surface_handle) !=
-           image_transport_clients_.end());
-    gfx::Size surface_size_in_pixel =
-        image_transport_clients_[params_in_pixel.surface_handle]->size();
+  if (compositor) {
+    const gfx::Size surface_size_in_pixel = params_in_pixel.surface_size;
+    DLOG_IF(ERROR, ack_params.texture_to_produce &&
+        ack_params.texture_to_produce->size() != current_texture->size() &&
+        damage_rect != surface_rect) <<
+        "Expected full damage rect after size change";
+    if (ack_params.texture_to_produce && !previous_damage_.isEmpty() &&
+        ack_params.texture_to_produce->size() == current_texture->size()) {
+      ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
+      GLHelper* gl_helper = factory->GetGLHelper();
+      gl_helper->CopySubBufferDamage(
+          current_texture->PrepareTexture(),
+          ack_params.texture_to_produce->PrepareTexture(),
+          damage,
+          previous_damage_);
+    }
+    previous_damage_ = damage;

[jonathan.backer, 2012/11/20 21:21:11]

This seems like too much damage! We're flipping and copying here. So the next
frame should be relative to damage rect passed in to this function, no?

[jonathan.backer, 2012/11/21 05:47:05]

Please ignore this comment.

 
     // Co-ordinates come in OpenGL co-ordinate space.
     // We need to convert to layer space.
     gfx::Rect rect_to_paint = ConvertRectToDIP(this, gfx::Rect(
         params_in_pixel.x,
         surface_size_in_pixel.height() - params_in_pixel.y -
-            params_in_pixel.height,
+        params_in_pixel.height,
         params_in_pixel.width,
         params_in_pixel.height));
 
@@ -935,17 +946,9 @@ void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
     rect_to_paint.Intersect(window_->bounds());
 
     window_->SchedulePaintInRect(rect_to_paint);
-
-    // Add sending an ACK to the list of things to do OnCompositingDidCommit
-    can_lock_compositor_ = NO_PENDING_COMMIT;
-    on_compositing_did_commit_callbacks_.push_back(
-        base::Bind(&RenderWidgetHostViewAura::InsertSyncPointAndACK,
-                   params_in_pixel.route_id,
-                   gpu_host_id,
-                   true));
-    if (!compositor->HasObserver(this))
-      compositor->AddObserver(this);
   }
+
+  SwapBuffersCompleted(ack_params);
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfaceSuspend() {
@@ -964,60 +967,46 @@ bool RenderWidgetHostViewAura::HasAcceleratedSurface(
 void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
       int32 width_in_pixel,
       int32 height_in_pixel,
-      uint64 surface_handle) {
+      uint64 surface_handle,
+      const std::string& mailbox_name) {
   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
   scoped_refptr<ui::Texture> surface(factory->CreateTransportClient(
       gfx::Size(width_in_pixel, height_in_pixel), device_scale_factor_,
-      surface_handle));
+      mailbox_name));
   if (!surface) {
     LOG(ERROR) << "Failed to create ImageTransport texture";
     return;
   }
-
   image_transport_clients_[surface_handle] = surface;
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfaceRelease(
     uint64 surface_handle) {
-  DCHECK(image_transport_clients_.find(surface_handle) !=
-         image_transport_clients_.end());
-  if (current_surface_ == surface_handle) {
+  // This really tells us to release the frontbuffer.
+  if (current_surface_ && ShouldReleaseFrontSurface()) {
+    ui::Compositor* compositor = GetCompositor();
+    if (compositor) {
+      // We need to wait for a commit to clear to guarantee that all we
+      // will not issue any more GL referencing the previous surface.
+      can_lock_compositor_ = NO_PENDING_COMMIT;
+      scoped_refptr<ui::Texture> surface_ref =
+          image_transport_clients_[surface_handle];
+      on_compositing_did_commit_callbacks_.push_back(
+          base::Bind(&RenderWidgetHostViewAura::
+                     SetSurfaceNotInUseByCompositor,
+                     AsWeakPtr(),
+                     surface_ref));

[jonathan.backer, 2012/11/20 21:21:11]

Isn't this a no-op now?

[piman, 2012/11/30 03:54:32]

My understanding is that it's just there to keep a refcount. Arguably we could
do it explicitly (a list of ui::Texture to release on commit) but I'm not sure
it'd be a net win.

[no sievers, 2012/12/01 00:58:38]

Yes, it's there to make sure we don't delete the texture until did_commit.

+      if (!compositor->HasObserver(this))
+        compositor->AddObserver(this);
+    }
+    image_transport_clients_.erase(current_surface_);
     current_surface_ = 0;
     UpdateExternalTexture();
   }
-  image_transport_clients_.erase(surface_handle);
 }
 
-void RenderWidgetHostViewAura::SetSurfaceNotInUseByCompositor(ui::Compositor*) {
-  if (current_surface_ || !host_->is_hidden())
-    return;
-  current_surface_in_use_by_compositor_ = false;
-  AdjustSurfaceProtection();
-}
-
-void RenderWidgetHostViewAura::AdjustSurfaceProtection() {
-  // If the current surface is non null, it is protected.
-  // If we are visible, it is protected.
-  // Otherwise, change to not proctected once done thumbnailing and compositing.
-  bool surface_is_protected =
-      current_surface_ ||
-      !host_->is_hidden() ||
-      (current_surface_is_protected_ &&
-          (pending_thumbnail_tasks_ > 0 ||
-              current_surface_in_use_by_compositor_));
-  if (current_surface_is_protected_ == surface_is_protected)
-    return;
-  current_surface_is_protected_ = surface_is_protected;
-  ++protection_state_id_;
-
-  if (!surface_route_id_ || !shared_surface_handle_.parent_gpu_process_id)
-    return;
-
-  RenderWidgetHostImpl::SendFrontSurfaceIsProtected(
-      surface_is_protected,
-      protection_state_id_,
-      surface_route_id_,
-      shared_surface_handle_.parent_gpu_process_id);
+void RenderWidgetHostViewAura::SetSurfaceNotInUseByCompositor(
+    scoped_refptr<ui::Texture>) {
 }
 
 void RenderWidgetHostViewAura::CopyFromCompositingSurfaceFinished(
@@ -1029,7 +1018,6 @@ void RenderWidgetHostViewAura::CopyFromCompositingSurfaceFinished(
   if (!render_widget_host_view.get())
     return;
   --render_widget_host_view->pending_thumbnail_tasks_;
-  render_widget_host_view->AdjustSurfaceProtection();
 }
 
 void RenderWidgetHostViewAura::SetBackground(const SkBitmap& background) {
@@ -1737,7 +1725,7 @@ void RenderWidgetHostViewAura::OnCompositingDidCommit(
       if ((*it)->GrabDeferredLock())
         can_lock_compositor_ = YES_DID_LOCK;
   }
-  RunCompositingDidCommitCallbacks(compositor);
+  RunCompositingDidCommitCallbacks();
   locks_pending_commit_.clear();
 }
 
@@ -1768,10 +1756,6 @@ void RenderWidgetHostViewAura::OnCompositingLockStateChanged(
 void RenderWidgetHostViewAura::OnLostResources() {
   image_transport_clients_.clear();
   current_surface_ = 0;
-  protection_state_id_ = 0;
-  current_surface_is_protected_ = true;
-  current_surface_in_use_by_compositor_ = true;
-  surface_route_id_ = 0;
   UpdateExternalTexture();
   locks_pending_commit_.clear();
 
@@ -1913,30 +1897,31 @@ bool RenderWidgetHostViewAura::ShouldMoveToCenter() {
       global_mouse_position_.y() > rect.bottom() - border_y;
 }
 
-void RenderWidgetHostViewAura::RunCompositingDidCommitCallbacks(
-    ui::Compositor* compositor) {
-  for (std::vector< base::Callback<void(ui::Compositor*)> >::const_iterator
+void RenderWidgetHostViewAura::RunCompositingDidCommitCallbacks() {
+  for (std::vector<base::Closure>::const_iterator
       it = on_compositing_did_commit_callbacks_.begin();
       it != on_compositing_did_commit_callbacks_.end(); ++it) {
-    it->Run(compositor);
+    it->Run();
   }
   on_compositing_did_commit_callbacks_.clear();
 }
 
 // static
 void RenderWidgetHostViewAura::InsertSyncPointAndACK(
-    int32 route_id, int gpu_host_id, bool presented,
-    ui::Compositor* compositor) {
+    const BufferPresentedParams& params) {
+  if (params.texture_to_produce)
+    params.texture_to_produce->Produce();
+
+  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();

[jonathan.backer, 2012/11/20 21:21:11]

nit: put this in the scope with the call to InsertSyncPoint().

[piman, 2012/11/30 03:54:32]

Agreed, and you can combine the bodies of the 2 ifs.

+
   uint32 sync_point = 0;
-  // If we have no compositor, so we must still send the ACK. A zero
-  // sync point will not be waited for in the GPU process.
-  if (compositor) {
-    ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
-    sync_point = factory->InsertSyncPoint();
-  }
+  // If we produced a texture, we have to synchronize with the consumer of
+  // that texture.
+  if (params.texture_to_produce)
+      sync_point = factory->InsertSyncPoint();

[piman, 2012/11/30 03:54:32]

nit: indent

 
   RenderWidgetHostImpl::AcknowledgeBufferPresent(
-      route_id, gpu_host_id, presented, sync_point);
+      params.route_id, params.gpu_host_id, params.surface_handle, sync_point);
 }
 
 void RenderWidgetHostViewAura::AddingToRootWindow() {
@@ -1953,7 +1938,7 @@ void RenderWidgetHostViewAura::RemovingFromRootWindow() {
   // frame though, because we will reissue a new frame right away without that
   // composited data.
   ui::Compositor* compositor = GetCompositor();
-  RunCompositingDidCommitCallbacks(compositor);
+  RunCompositingDidCommitCallbacks();
   locks_pending_commit_.clear();
   if (compositor && compositor->HasObserver(this))
     compositor->RemoveObserver(this);