Index: third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp |
diff --git a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp |
index 8cdbb05dc1246699d64a6776a91c745599992618..04aa87393e718d232105fae4a35a8caeaedfd681 100644 |
--- a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp |
+++ b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp |
@@ -210,6 +210,18 @@ void OffscreenCanvasFrameDispatcherImpl::dispatchFrame( |
cc::CompositorFrame frame; |
// TODO(crbug.com/652931): update the device_scale_factor |
frame.metadata.device_scale_factor = 1.0f; |
+ if (m_currentBeginFrameAck.sequence_number == |
+ cc::BeginFrameArgs::kInvalidFrameNumber) { |
+ // TODO(eseckler): This shouldn't be necessary when OffscreenCanvas no |
+ // longer submits CompositorFrames without prior BeginFrame. |
+ m_currentBeginFrameAck = |
+ cc::BeginFrameAck(cc::BeginFrameArgs::kManualSourceId, |
+ cc::BeginFrameArgs::kStartingFrameNumber, |
+ cc::BeginFrameArgs::kStartingFrameNumber, 0, true); |
+ } else { |
+ m_currentBeginFrameAck.has_damage = true; |
+ } |
+ frame.metadata.begin_frame_ack = m_currentBeginFrameAck; |
const gfx::Rect bounds(m_width, m_height); |
const int renderPassId = 1; |
@@ -393,7 +405,14 @@ void OffscreenCanvasFrameDispatcherImpl::setNeedsBeginFrame( |
void OffscreenCanvasFrameDispatcherImpl::OnBeginFrame( |
const cc::BeginFrameArgs& beginFrameArgs) { |
DCHECK(client()); |
+ // TODO(eseckler): Set correct |latest_confirmed_sequence_number|. |
+ m_currentBeginFrameAck = cc::BeginFrameAck( |
+ beginFrameArgs.source_id, beginFrameArgs.sequence_number, |
+ beginFrameArgs.sequence_number, 0, false); |
client()->beginFrame(); |
+ // TODO(eseckler): Tell |m_sink| if we did not draw during the BeginFrame. |
+ m_currentBeginFrameAck.sequence_number = |
+ cc::BeginFrameArgs::kInvalidFrameNumber; |
} |
void OffscreenCanvasFrameDispatcherImpl::ReclaimResources( |