Add CastExternalBeginFrameClient

Add CastExternalBeginFrameClient to eventually allow 4hz refresh rate on
audio-only cast devices

Bug: b/139299756
Test: Compile and run cast_shell
Change-Id: Ia2e1531a1035ed92ee61cee69dc24c491d6ca109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763435
Commit-Queue: Shawn Gallea <sagallea@google.com>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690098}

chromecast/graphics/BUILD.gn

@@ -45,6 +45,8 @@ cast_source_set("graphics") {
       "accessibility/partial_magnification_controller.h",
       "cast_display_util.cc",
       "cast_display_util.h",
+      "cast_external_begin_frame_client.cc",
+      "cast_external_begin_frame_client.h",
       "cast_focus_client_aura.cc",
       "cast_focus_client_aura.h",
       "cast_touch_event_gate.cc",
@@ -62,6 +64,7 @@ cast_source_set("graphics") {
     ]
 
     deps += [
+      "//components/viz/common",
       "//ui/base/ime/init",
       "//ui/events:gesture_detection",
       "//ui/views",

chromecast/graphics/cast_external_begin_frame_client.cc

+// Copyright 2019 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 "chromecast/graphics/cast_external_begin_frame_client.h"
+
+#include "base/time/time.h"
+#include "chromecast/graphics/cast_window_manager_aura.h"
+
+namespace chromecast {
+
+CastExternalBeginFrameClient::CastExternalBeginFrameClient(
+    CastWindowManagerAura* cast_window_manager_aura)
+    : cast_window_manager_aura_(cast_window_manager_aura),
+      sequence_number_(viz::BeginFrameArgs::kStartingFrameNumber),
+      source_id_(viz::BeginFrameArgs::kManualSourceId),
+      interval_(base::TimeDelta::FromMilliseconds(250)),
+      frame_in_flight_(false) {}
+
+CastExternalBeginFrameClient::~CastExternalBeginFrameClient() {}
+
+void CastExternalBeginFrameClient::OnDisplayDidFinishFrame(
+    const viz::BeginFrameAck& ack) {
+  if (ack.source_id == source_id_)
+    frame_in_flight_ = false;
+}
+
+void CastExternalBeginFrameClient::OnNeedsExternalBeginFrames(
+    bool needs_begin_frames) {
+  if (needs_begin_frames)
+    timer_.Start(FROM_HERE, interval_, this,
+                 &CastExternalBeginFrameClient::IssueExternalBeginFrame);
+  else
+    timer_.Stop();
+}
+
+void CastExternalBeginFrameClient::IssueExternalBeginFrame() {
+  if (!frame_in_flight_) {
+    viz::BeginFrameArgs args = viz::BeginFrameArgs::Create(
+        BEGINFRAME_FROM_HERE, source_id_, sequence_number_,
+        base::TimeTicks::Now(), base::TimeTicks::Now() + interval_, interval_,
+        viz::BeginFrameArgs::NORMAL);
+    ui::Compositor* compositor =
+        cast_window_manager_aura_->window_tree_host()->compositor();
+    compositor->context_factory_private()->IssueExternalBeginFrame(compositor,
+                                                                   args);
+    sequence_number_++;
+    frame_in_flight_ = true;
+  }
+}
+
+}  // namespace chromecast

chromecast/graphics/cast_external_begin_frame_client.h

+// Copyright 2019 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.
+
+#ifndef CHROMECAST_GRAPHICS_CAST_EXTERNAL_BEGIN_FRAME_CLIENT_H_
+#define CHROMECAST_GRAPHICS_CAST_EXTERNAL_BEGIN_FRAME_CLIENT_H_
+
+#include "ui/compositor/external_begin_frame_client.h"
+
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+
+namespace chromecast {
+
+class CastWindowManagerAura;
+
+class CastExternalBeginFrameClient : public ui::ExternalBeginFrameClient {
+ public:
+  CastExternalBeginFrameClient(CastWindowManagerAura* cast_window_manager_aura);
+  ~CastExternalBeginFrameClient() override;
+
+  // ui::ExternalBeginFrameClient implementation:
+  void OnDisplayDidFinishFrame(const viz::BeginFrameAck& ack) override;
+  void OnNeedsExternalBeginFrames(bool needs_begin_frames) override;
+
+ private:
+  void IssueExternalBeginFrame();
+
+  CastWindowManagerAura* cast_window_manager_aura_;
+  uint64_t sequence_number_;
+  const uint64_t source_id_;
+  const base::TimeDelta interval_;
+  bool frame_in_flight_;
+  base::RepeatingTimer timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastExternalBeginFrameClient);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_GRAPHICS_CAST_EXTERNAL_BEGIN_FRAME_CLIENT_H_