Connect to DesktopEnvironment's stubs only when audio/video schedulers are about to be created.

This CL localizes usage of DesktopEnvironment to a single method that creates audio/video schedulers and hook up the event executor. This prepares further refactoring of DesktopEnvironment that should become a factory for classes interacting with the specific desktop environment.

Related changes in this CL:
  - MouseClampingFilter receives screen size on the proper thread.
  - ClientSessionTest.* tests now run asynchronously to support MouseClampingFilter change.
  - ClientSession does not expose DesktopEnvironment.
  - InputEventTracker can be re-attached to a different InputStub.

BUG=104544


Review URL: https://chromiumcodereview.appspot.com/11781003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175648 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 290 insertions, 193 deletions

diff --git a/remoting/capturer/video_frame_capturer_fake.cc b/remoting/capturer/video_frame_capturer_fake.cc
index a27e62cf1..7c25432 100644
--- a/remoting/capturer/video_frame_capturer_fake.cc
+++ b/remoting/capturer/video_frame_capturer_fake.cc
@@ -12,8 +12,8 @@ namespace remoting {
 // VideoFrameCapturerFake generates a white picture of size kWidth x kHeight
 // with a rectangle of size kBoxWidth x kBoxHeight. The rectangle moves kSpeed
 // pixels per frame along both axes, and bounces off the sides of the screen.
-static const int kWidth = 800;
-static const int kHeight = 600;
+static const int kWidth = VideoFrameCapturerFake::kWidth;
+static const int kHeight = VideoFrameCapturerFake::kHeight;
 static const int kBoxWidth = 140;
 static const int kBoxHeight = 140;
 static const int kSpeed = 20;
diff --git a/remoting/capturer/video_frame_capturer_fake.h b/remoting/capturer/video_frame_capturer_fake.h
index c3a818b..0547796 100644
--- a/remoting/capturer/video_frame_capturer_fake.h
+++ b/remoting/capturer/video_frame_capturer_fake.h
@@ -17,6 +17,10 @@ namespace remoting {
 // See remoting/host/video_frame_capturer.h.
 class VideoFrameCapturerFake : public VideoFrameCapturer {
  public:
+  // VideoFrameCapturerFake generates a picture of size kWidth x kHeight.
+  static const int kWidth = 800;
+  static const int kHeight = 600;
+
   VideoFrameCapturerFake();
   virtual ~VideoFrameCapturerFake();
 
diff --git a/remoting/host/chromoting_host_unittest.cc b/remoting/host/chromoting_host_unittest.cc
index 6e7c326..0235512 100644
--- a/remoting/host/chromoting_host_unittest.cc
+++ b/remoting/host/chromoting_host_unittest.cc
@@ -244,8 +244,6 @@ class ChromotingHostTest : public testing::Test {
         desktop_environment_factory_.get(),
         base::TimeDelta());
     connection_ptr->set_host_stub(client);
-    connection_ptr->set_input_stub(
-        client->desktop_environment()->event_executor());
 
     ui_task_runner_->PostTask(
         FROM_HERE, base::Bind(&ChromotingHostTest::AddClientToHost,
diff --git a/remoting/host/client_session.cc b/remoting/host/client_session.cc
index f172259..58320c9 100644
--- a/remoting/host/client_session.cc
+++ b/remoting/host/client_session.cc
@@ -41,13 +41,10 @@ ClientSession::ClientSession(
       connection_factory_(connection_.get()),
       desktop_environment_(desktop_environment_factory->Create()),
       client_jid_(connection_->session()->jid()),
-      host_clipboard_stub_(desktop_environment_->event_executor()),
-      host_input_stub_(desktop_environment_->event_executor()),
-      input_tracker_(host_input_stub_),
+      input_tracker_(&host_input_filter_),
       remote_input_filter_(&input_tracker_),
-      mouse_clamping_filter_(desktop_environment_->video_capturer(),
-                             &remote_input_filter_),
-      disable_input_filter_(&mouse_clamping_filter_),
+      mouse_clamping_filter_(&remote_input_filter_, connection_->video_stub()),
+      disable_input_filter_(mouse_clamping_filter_.input_filter()),
       disable_clipboard_filter_(clipboard_echo_filter_.host_filter()),
       auth_input_filter_(&disable_input_filter_),
       auth_clipboard_filter_(&disable_clipboard_filter_),
@@ -66,7 +63,6 @@ ClientSession::ClientSession(
   connection_->set_clipboard_stub(&auth_clipboard_filter_);
   connection_->set_host_stub(this);
   connection_->set_input_stub(&auth_input_filter_);
-  clipboard_echo_filter_.set_host_stub(host_clipboard_stub_);
 
   // |auth_*_filter_|'s states reflect whether the session is authenticated.
   auth_input_filter_.set_enabled(false);
@@ -127,6 +123,11 @@ void ClientSession::OnConnectionChannelsConnected(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
+
+  // Connect the host clipboard and input stubs.
+  host_input_filter_.set_input_stub(desktop_environment_->event_executor());
+  clipboard_echo_filter_.set_host_stub(desktop_environment_->event_executor());
+
   SetDisableInputs(false);
 
   // Let the desktop environment notify us of local clipboard changes.
@@ -148,7 +149,7 @@ void ClientSession::OnConnectionChannelsConnected(
       desktop_environment_->video_capturer(),
       video_encoder.Pass(),
       connection_->client_stub(),
-      connection_->video_stub());
+      &mouse_clamping_filter_);
   ++active_recorders_;
 
   // Create an AudioScheduler if audio is enabled, to pump audio samples.
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index c4e0657..f61cb53 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -133,10 +133,6 @@ class ClientSession
     return connection_.get();
   }
 
-  DesktopEnvironment* desktop_environment() const {
-    return desktop_environment_.get();
-  }
-
   const std::string& client_jid() { return client_jid_; }
 
   bool is_authenticated() { return auth_input_filter_.enabled();  }
@@ -181,11 +177,8 @@ class ClientSession
 
   std::string client_jid_;
 
-  // The host clipboard and input stubs to which this object delegates.
-  // These are the final elements in the clipboard & input pipelines, which
-  // appear in order below.
-  protocol::ClipboardStub* host_clipboard_stub_;
-  protocol::InputStub* host_input_stub_;
+  // Filter used as the final element in the input pipeline.
+  protocol::InputFilter host_input_filter_;
 
   // Tracker used to release pressed keys and buttons when disconnecting.
   protocol::InputEventTracker input_tracker_;
@@ -197,7 +190,8 @@ class ClientSession
   MouseClampingFilter mouse_clamping_filter_;
 
   // Filter to used to stop clipboard items sent from the client being echoed
-  // back to it.
+  // back to it.  It is the final element in the clipboard (client -> host)
+  // pipeline.
   protocol::ClipboardEchoFilter clipboard_echo_filter_;
 
   // Filters used to manage enabling & disabling of input & clipboard.
diff --git a/remoting/host/client_session_unittest.cc b/remoting/host/client_session_unittest.cc
index 050304c..285bf4a 100644
--- a/remoting/host/client_session_unittest.cc
+++ b/remoting/host/client_session_unittest.cc
@@ -6,6 +6,7 @@
 #include "remoting/base/auto_thread_task_runner.h"
 #include "remoting/base/constants.h"
 #include "remoting/capturer/video_capturer_mock_objects.h"
+#include "remoting/capturer/video_frame_capturer_fake.h"
 #include "remoting/host/audio_capturer.h"
 #include "remoting/host/client_session.h"
 #include "remoting/host/desktop_environment.h"
@@ -26,111 +27,68 @@ using protocol::SessionConfig;
 using testing::_;
 using testing::AnyNumber;
 using testing::DeleteArg;
+using testing::DoAll;
 using testing::Expectation;
 using testing::InSequence;
 using testing::Return;
 using testing::ReturnRef;
 
+namespace {
+
+ACTION_P2(InjectClipboardEvent, connection, event) {
+  connection->clipboard_stub()->InjectClipboardEvent(event);
+}
+
+ACTION_P2(InjectKeyEvent, connection, event) {
+  connection->input_stub()->InjectKeyEvent(event);
+}
+
+ACTION_P2(InjectMouseEvent, connection, event) {
+  connection->input_stub()->InjectMouseEvent(event);
+}
+
+ACTION_P2(LocalMouseMoved, client_session, event) {
+  client_session->LocalMouseMoved(SkIPoint::Make(event.x(), event.y()));
+}
+
+}  // namespace
+
 class ClientSessionTest : public testing::Test {
  public:
-  ClientSessionTest() : event_executor_(NULL) {}
-
-  virtual void SetUp() OVERRIDE {
-    ui_task_runner_ = new AutoThreadTaskRunner(
-        message_loop_.message_loop_proxy(),
-        base::Bind(&ClientSessionTest::QuitMainMessageLoop,
-                   base::Unretained(this)));
-
-    client_jid_ = "user@domain/rest-of-jid";
-
-    desktop_environment_factory_.reset(new MockDesktopEnvironmentFactory());
-    EXPECT_CALL(*desktop_environment_factory_, CreatePtr())
-        .Times(AnyNumber())
-        .WillRepeatedly(Invoke(this,
-                               &ClientSessionTest::CreateDesktopEnvironment));
-
-    // Set up a large default screen size that won't affect most tests.
-    screen_size_.set(1000, 1000);
-
-    session_config_ = SessionConfig::ForTest();
-
-    // Mock protocol::Session APIs called directly by ClientSession.
-    protocol::MockSession* session = new MockSession();
-    EXPECT_CALL(*session, config()).WillRepeatedly(ReturnRef(session_config_));
-    EXPECT_CALL(*session, jid()).WillRepeatedly(ReturnRef(client_jid_));
-    EXPECT_CALL(*session, SetEventHandler(_));
-
-    // Mock protocol::ConnectionToClient APIs called directly by ClientSession.
-    // HostStub is not touched by ClientSession, so we can safely pass NULL.
-    scoped_ptr<MockConnectionToClient> connection(
-        new MockConnectionToClient(session, NULL));
-    EXPECT_CALL(*connection, session()).WillRepeatedly(Return(session));
-    EXPECT_CALL(*connection, client_stub())
-        .WillRepeatedly(Return(&client_stub_));
-    EXPECT_CALL(*connection, video_stub()).WillRepeatedly(Return(&video_stub_));
-    EXPECT_CALL(*connection, Disconnect());
-    connection_ = connection.get();
-
-    client_session_ = new ClientSession(
-        &session_event_handler_,
-        ui_task_runner_, // Audio thread.
-        ui_task_runner_, // Capture thread.
-        ui_task_runner_, // Encode thread.
-        ui_task_runner_, // Network thread.
-        connection.PassAs<protocol::ConnectionToClient>(),
-        desktop_environment_factory_.get(),
-        base::TimeDelta());
-  }
+  ClientSessionTest()
+      : client_jid_("user@domain/rest-of-jid"),
+        event_executor_(NULL) {}
 
-  virtual void TearDown() OVERRIDE {
-    // MockClientSessionEventHandler won't trigger Stop, so fake it.
-    client_session_->Stop(base::Bind(
-        &ClientSessionTest::OnClientStopped, base::Unretained(this)));
+  virtual void SetUp() OVERRIDE;
+  virtual void TearDown() OVERRIDE;
 
-    // Run message loop before destroying because the session is destroyed
-    // asynchronously.
-    ui_task_runner_ = NULL;
-    message_loop_.Run();
+  // Disconnects the client session.
+  void DisconnectClientSession();
 
-    // Verify that the client session has been stopped.
-    EXPECT_TRUE(client_session_.get() == NULL);
-  }
+  // Asynchronously stops the client session. OnClientStopped() will be called
+  // once the client session is fully stopped.
+  void StopClientSession();
 
  protected:
-  DesktopEnvironment* CreateDesktopEnvironment() {
-    MockVideoFrameCapturer* capturer = new MockVideoFrameCapturer();
-    EXPECT_CALL(*capturer, Start(_));
-    EXPECT_CALL(*capturer, Stop());
-    EXPECT_CALL(*capturer, InvalidateRegion(_)).Times(AnyNumber());
-    EXPECT_CALL(*capturer, CaptureFrame()).Times(AnyNumber());
-    EXPECT_CALL(*capturer, size_most_recent())
-        .WillRepeatedly(ReturnRef(screen_size_));
-
-    EXPECT_TRUE(!event_executor_);
-    event_executor_ = new MockEventExecutor();
-    return new DesktopEnvironment(scoped_ptr<AudioCapturer>(NULL),
-                                  scoped_ptr<EventExecutor>(event_executor_),
-                                  scoped_ptr<VideoFrameCapturer>(capturer));
-  }
+  // Creates a DesktopEnvironment with a fake VideoFrameCapturer, to mock
+  // DesktopEnvironmentFactory::Create().
+  DesktopEnvironment* CreateDesktopEnvironment();
 
-  void DisconnectClientSession() {
-    client_session_->Disconnect();
-    // MockSession won't trigger OnConnectionClosed, so fake it.
-    client_session_->OnConnectionClosed(client_session_->connection(),
-                                        protocol::OK);
-  }
+  // Notifies the client session that the client connection has been
+  // authenticated and channels have been connected. This effectively enables
+  // the input pipe line and starts video capturing.
+  void ConnectClientSession();
 
-  void QuitMainMessageLoop() {
-    message_loop_.PostTask(FROM_HERE, MessageLoop::QuitClosure());
-  }
+  // Invoked when the last reference to the AutoThreadTaskRunner has been
+  // released and quits the message loop to finish the test.
+  void QuitMainMessageLoop();
 
-  void OnClientStopped() {
-    client_session_ = NULL;
-  }
+  // Releases the ClientSession when it has been fully stopped, allowing
+  // the MessageLoop to quit.
+  void OnClientStopped();
 
   // Message loop passed to |client_session_| to perform all functions on.
   MessageLoop message_loop_;
-  scoped_refptr<AutoThreadTaskRunner> ui_task_runner_;
 
   // ClientSession instance under test.
   scoped_refptr<ClientSession> client_session_;
@@ -138,12 +96,9 @@ class ClientSessionTest : public testing::Test {
   // ClientSession::EventHandler mock for use in tests.
   MockClientSessionEventHandler session_event_handler_;
 
-  // Screen size that the fake VideoFrameCapturer should report.
-  SkISize screen_size_;
-
   // Storage for values to be returned by the protocol::Session mock.
   SessionConfig session_config_;
-  std::string client_jid_;
+  const std::string client_jid_;
 
   // Stubs returned to |client_session_| components by |connection_|.
   MockClientStub client_stub_;
@@ -159,6 +114,90 @@ class ClientSessionTest : public testing::Test {
   scoped_ptr<MockDesktopEnvironmentFactory> desktop_environment_factory_;
 };
 
+void ClientSessionTest::SetUp() {
+  // Arrange to run |message_loop_| until no components depend on it.
+  scoped_refptr<AutoThreadTaskRunner> ui_task_runner = new AutoThreadTaskRunner(
+      message_loop_.message_loop_proxy(),
+      base::Bind(&ClientSessionTest::QuitMainMessageLoop,
+                 base::Unretained(this)));
+
+  desktop_environment_factory_.reset(new MockDesktopEnvironmentFactory());
+  EXPECT_CALL(*desktop_environment_factory_, CreatePtr())
+      .Times(AnyNumber())
+      .WillRepeatedly(Invoke(this,
+                             &ClientSessionTest::CreateDesktopEnvironment));
+
+  session_config_ = SessionConfig::ForTest();
+
+  // Mock protocol::Session APIs called directly by ClientSession.
+  protocol::MockSession* session = new MockSession();
+  EXPECT_CALL(*session, config()).WillRepeatedly(ReturnRef(session_config_));
+  EXPECT_CALL(*session, jid()).WillRepeatedly(ReturnRef(client_jid_));
+  EXPECT_CALL(*session, SetEventHandler(_));
+
+  // Mock protocol::ConnectionToClient APIs called directly by ClientSession.
+  // HostStub is not touched by ClientSession, so we can safely pass NULL.
+  scoped_ptr<MockConnectionToClient> connection(
+      new MockConnectionToClient(session, NULL));
+  EXPECT_CALL(*connection, session()).WillRepeatedly(Return(session));
+  EXPECT_CALL(*connection, client_stub())
+      .WillRepeatedly(Return(&client_stub_));
+  EXPECT_CALL(*connection, video_stub()).WillRepeatedly(Return(&video_stub_));
+  EXPECT_CALL(*connection, Disconnect());
+  connection_ = connection.get();
+
+  client_session_ = new ClientSession(
+      &session_event_handler_,
+      ui_task_runner, // Audio thread.
+      ui_task_runner, // Capture thread.
+      ui_task_runner, // Encode thread.
+      ui_task_runner, // Network thread.
+      connection.PassAs<protocol::ConnectionToClient>(),
+      desktop_environment_factory_.get(),
+      base::TimeDelta());
+}
+
+void ClientSessionTest::TearDown() {
+  // Verify that the client session has been stopped.
+  EXPECT_TRUE(client_session_.get() == NULL);
+}
+
+void ClientSessionTest::DisconnectClientSession() {
+  client_session_->Disconnect();
+  // MockSession won't trigger OnConnectionClosed, so fake it.
+  client_session_->OnConnectionClosed(client_session_->connection(),
+                                      protocol::OK);
+}
+
+void ClientSessionTest::StopClientSession() {
+  // MockClientSessionEventHandler won't trigger Stop, so fake it.
+  client_session_->Stop(base::Bind(
+      &ClientSessionTest::OnClientStopped, base::Unretained(this)));
+}
+
+DesktopEnvironment* ClientSessionTest::CreateDesktopEnvironment() {
+  scoped_ptr<VideoFrameCapturer> video_capturer(new VideoFrameCapturerFake());
+
+  EXPECT_TRUE(!event_executor_);
+  event_executor_ = new MockEventExecutor();
+  return new DesktopEnvironment(scoped_ptr<AudioCapturer>(NULL),
+                                scoped_ptr<EventExecutor>(event_executor_),
+                                video_capturer.Pass());
+}
+
+void ClientSessionTest::ConnectClientSession() {
+  client_session_->OnConnectionAuthenticated(client_session_->connection());
+  client_session_->OnConnectionChannelsConnected(client_session_->connection());
+}
+
+void ClientSessionTest::QuitMainMessageLoop() {
+  message_loop_.PostTask(FROM_HERE, MessageLoop::QuitClosure());
+}
+
+void ClientSessionTest::OnClientStopped() {
+  client_session_ = NULL;
+}
+
 MATCHER_P2(EqualsClipboardEvent, m, d, "") {
   return (strcmp(arg.mime_type().c_str(), m) == 0 &&
       memcmp(arg.data().data(), d, arg.data().size()) == 0);
@@ -181,6 +220,19 @@ TEST_F(ClientSessionTest, ClipboardStubFilter) {
   EXPECT_CALL(session_event_handler_, OnSessionAuthenticated(_));
   EXPECT_CALL(*event_executor_, StartPtr(_));
   EXPECT_CALL(session_event_handler_, OnSessionChannelsConnected(_));
+
+  // Wait for the first video packet to be captured to make sure that
+  // the injected input will go though. Otherwise mouse events will be blocked
+  // by the mouse clamping filter.
+  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
+      .WillOnce(DoAll(
+          // This event should get through to the clipboard stub.
+          InjectClipboardEvent(connection_, clipboard_event2),
+          InvokeWithoutArgs(this, &ClientSessionTest::DisconnectClientSession),
+          // This event should not get through to the clipboard stub,
+          // because the client has disconnected.
+          InjectClipboardEvent(connection_, clipboard_event3),
+          InvokeWithoutArgs(this, &ClientSessionTest::StopClientSession)));
   EXPECT_CALL(*event_executor_, InjectClipboardEvent(EqualsClipboardEvent(
       kMimeTypeTextUtf8, "b")));
   EXPECT_CALL(session_event_handler_, OnSessionClosed(_));
@@ -188,14 +240,9 @@ TEST_F(ClientSessionTest, ClipboardStubFilter) {
   // This event should not get through to the clipboard stub,
   // because the client isn't authenticated yet.
   connection_->clipboard_stub()->InjectClipboardEvent(clipboard_event1);
-  client_session_->OnConnectionAuthenticated(client_session_->connection());
-  client_session_->OnConnectionChannelsConnected(client_session_->connection());
-  // This event should get through to the clipboard stub.
-  connection_->clipboard_stub()->InjectClipboardEvent(clipboard_event2);
-  DisconnectClientSession();
-  // This event should not get through to the clipboard stub,
-  // because the client has disconnected.
-  connection_->clipboard_stub()->InjectClipboardEvent(clipboard_event3);
+
+  ConnectClientSession();
+  message_loop_.Run();
 }
 
 MATCHER_P2(EqualsUsbEvent, usb_keycode, pressed, "") {
@@ -244,6 +291,22 @@ TEST_F(ClientSessionTest, InputStubFilter) {
   EXPECT_CALL(session_event_handler_, OnSessionAuthenticated(_));
   EXPECT_CALL(*event_executor_, StartPtr(_));
   EXPECT_CALL(session_event_handler_, OnSessionChannelsConnected(_));
+
+  // Wait for the first video packet to be captured to make sure that
+  // the injected input will go though. Otherwise mouse events will be blocked
+  // by the mouse clamping filter.
+  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
+      .WillOnce(DoAll(
+          // These events should get through to the input stub.
+          InjectKeyEvent(connection_, key_event2_down),
+          InjectKeyEvent(connection_, key_event2_up),
+          InjectMouseEvent(connection_, mouse_event2),
+          InvokeWithoutArgs(this, &ClientSessionTest::DisconnectClientSession),
+          // These events should not get through to the input stub,
+          // because the client has disconnected.
+          InjectKeyEvent(connection_, key_event3),
+          InjectMouseEvent(connection_, mouse_event3),
+          InvokeWithoutArgs(this, &ClientSessionTest::StopClientSession)));
   EXPECT_CALL(*event_executor_, InjectKeyEvent(EqualsUsbEvent(2, true)));
   EXPECT_CALL(*event_executor_, InjectKeyEvent(EqualsUsbEvent(2, false)));
   EXPECT_CALL(*event_executor_, InjectMouseEvent(EqualsMouseEvent(200, 201)));
@@ -253,17 +316,9 @@ TEST_F(ClientSessionTest, InputStubFilter) {
   // because the client isn't authenticated yet.
   connection_->input_stub()->InjectKeyEvent(key_event1);
   connection_->input_stub()->InjectMouseEvent(mouse_event1);
-  client_session_->OnConnectionAuthenticated(client_session_->connection());
-  client_session_->OnConnectionChannelsConnected(client_session_->connection());
-  // These events should get through to the input stub.
-  connection_->input_stub()->InjectKeyEvent(key_event2_down);
-  connection_->input_stub()->InjectKeyEvent(key_event2_up);
-  connection_->input_stub()->InjectMouseEvent(mouse_event2);
-  DisconnectClientSession();
-  // These events should not get through to the input stub,
-  // because the client has disconnected.
-  connection_->input_stub()->InjectKeyEvent(key_event3);
-  connection_->input_stub()->InjectMouseEvent(mouse_event3);
+
+  ConnectClientSession();
+  message_loop_.Run();
 }
 
 TEST_F(ClientSessionTest, LocalInputTest) {
@@ -281,25 +336,30 @@ TEST_F(ClientSessionTest, LocalInputTest) {
   EXPECT_CALL(session_event_handler_, OnSessionAuthenticated(_));
   EXPECT_CALL(*event_executor_, StartPtr(_));
   EXPECT_CALL(session_event_handler_, OnSessionChannelsConnected(_));
+
+  // Wait for the first video packet to be captured to make sure that
+  // the injected input will go though. Otherwise mouse events will be blocked
+  // by the mouse clamping filter.
+  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
+      .WillOnce(DoAll(
+          // This event should get through to the input stub.
+          InjectMouseEvent(connection_, mouse_event1),
+          // This one should too because the local event echoes the remote one.
+          LocalMouseMoved(client_session_.get(), mouse_event1),
+          InjectMouseEvent(connection_, mouse_event2),
+          // This one should not.
+          LocalMouseMoved(client_session_.get(), mouse_event1),
+          InjectMouseEvent(connection_, mouse_event3),
+          // TODO(jamiewalch): Verify that remote inputs are re-enabled
+          // eventually (via dependency injection, not sleep!)
+          InvokeWithoutArgs(this, &ClientSessionTest::DisconnectClientSession),
+          InvokeWithoutArgs(this, &ClientSessionTest::StopClientSession)));
   EXPECT_CALL(*event_executor_, InjectMouseEvent(EqualsMouseEvent(100, 101)));
   EXPECT_CALL(*event_executor_, InjectMouseEvent(EqualsMouseEvent(200, 201)));
   EXPECT_CALL(session_event_handler_, OnSessionClosed(_));
 
-  client_session_->OnConnectionAuthenticated(client_session_->connection());
-  client_session_->OnConnectionChannelsConnected(client_session_->connection());
-  // This event should get through to the input stub.
-  connection_->input_stub()->InjectMouseEvent(mouse_event1);
-  // This one should too because the local event echoes the remote one.
-  client_session_->LocalMouseMoved(SkIPoint::Make(mouse_event1.x(),
-                                                  mouse_event1.y()));
-  connection_->input_stub()->InjectMouseEvent(mouse_event2);
-  // This one should not.
-  client_session_->LocalMouseMoved(SkIPoint::Make(mouse_event1.x(),
-                                                  mouse_event1.y()));
-  connection_->input_stub()->InjectMouseEvent(mouse_event3);
-  // TODO(jamiewalch): Verify that remote inputs are re-enabled eventually
-  // (via dependency injection, not sleep!)
-  DisconnectClientSession();
+  ConnectClientSession();
+  message_loop_.Run();
 }
 
 TEST_F(ClientSessionTest, RestoreEventState) {
@@ -319,6 +379,17 @@ TEST_F(ClientSessionTest, RestoreEventState) {
   EXPECT_CALL(session_event_handler_, OnSessionAuthenticated(_));
   EXPECT_CALL(*event_executor_, StartPtr(_));
   EXPECT_CALL(session_event_handler_, OnSessionChannelsConnected(_));
+
+  // Wait for the first video packet to be captured to make sure that
+  // the injected input will go though. Otherwise mouse events will be blocked
+  // by the mouse clamping filter.
+  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
+      .WillOnce(DoAll(
+          InjectKeyEvent(connection_, key1),
+          InjectKeyEvent(connection_, key2),
+          InjectMouseEvent(connection_, mousedown),
+          InvokeWithoutArgs(this, &ClientSessionTest::DisconnectClientSession),
+          InvokeWithoutArgs(this, &ClientSessionTest::StopClientSession)));
   EXPECT_CALL(*event_executor_, InjectKeyEvent(EqualsUsbEvent(1, true)));
   EXPECT_CALL(*event_executor_, InjectKeyEvent(EqualsUsbEvent(2, true)));
   EXPECT_CALL(*event_executor_, InjectMouseEvent(EqualsMouseButtonEvent(
@@ -329,48 +400,62 @@ TEST_F(ClientSessionTest, RestoreEventState) {
       protocol::MouseEvent::BUTTON_LEFT, false)));
   EXPECT_CALL(session_event_handler_, OnSessionClosed(_));
 
-  client_session_->OnConnectionAuthenticated(client_session_->connection());
-  client_session_->OnConnectionChannelsConnected(client_session_->connection());
-
-  connection_->input_stub()->InjectKeyEvent(key1);
-  connection_->input_stub()->InjectKeyEvent(key2);
-  connection_->input_stub()->InjectMouseEvent(mousedown);
-
-  DisconnectClientSession();
+  ConnectClientSession();
+  message_loop_.Run();
 }
 
 TEST_F(ClientSessionTest, ClampMouseEvents) {
-  screen_size_.set(200, 100);
-
   EXPECT_CALL(session_event_handler_, OnSessionAuthenticated(_));
   EXPECT_CALL(*event_executor_, StartPtr(_));
   Expectation connected =
       EXPECT_CALL(session_event_handler_, OnSessionChannelsConnected(_));
   EXPECT_CALL(session_event_handler_, OnSessionClosed(_));
 
-  client_session_->OnConnectionAuthenticated(client_session_->connection());
-  client_session_->OnConnectionChannelsConnected(client_session_->connection());
-
   int input_x[3] = { -999, 100, 999 };
-  int expected_x[3] = { 0, 100, 199 };
+  int expected_x[3] = { 0, 100, VideoFrameCapturerFake::kWidth - 1 };
   int input_y[3] = { -999, 50, 999 };
-  int expected_y[3] = { 0, 50, 99 };
-
-  protocol::MouseEvent event;
+  int expected_y[3] = { 0, 50, VideoFrameCapturerFake::kHeight - 1 };
+
+  // Inject the 1st event once a video packet has been received.
+  protocol::MouseEvent injected_event;
+  injected_event.set_x(input_x[0]);
+  injected_event.set_y(input_y[0]);
+  connected =
+      EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
+          .After(connected)
+          .WillOnce(InjectMouseEvent(connection_, injected_event));
+
+  protocol::MouseEvent expected_event;
   for (int j = 0; j < 3; j++) {
     for (int i = 0; i < 3; i++) {
-      event.set_x(input_x[i]);
-      event.set_y(input_y[j]);
-      connected =
-          EXPECT_CALL(*event_executor_,
-                      InjectMouseEvent(EqualsMouseEvent(expected_x[i],
-                                                        expected_y[j])))
-              .After(connected);
-      connection_->input_stub()->InjectMouseEvent(event);
+      // Skip the first iteration since the 1st event has been injected already.
+      if (i > 0 || j > 0) {
+        injected_event.set_x(input_x[i]);
+        injected_event.set_y(input_y[j]);
+        connected =
+            EXPECT_CALL(*event_executor_,
+                        InjectMouseEvent(EqualsMouseEvent(expected_event.x(),
+                                                          expected_event.y())))
+                .After(connected)
+                .WillOnce(InjectMouseEvent(connection_, injected_event));
+      }
+
+      expected_event.set_x(expected_x[i]);
+      expected_event.set_y(expected_y[j]);
     }
   }
 
-  DisconnectClientSession();
+  // Shutdown the connection once the last event has been received.
+  EXPECT_CALL(*event_executor_,
+              InjectMouseEvent(EqualsMouseEvent(expected_event.x(),
+                                                expected_event.y())))
+      .After(connected)
+      .WillOnce(DoAll(
+          InvokeWithoutArgs(this, &ClientSessionTest::DisconnectClientSession),
+          InvokeWithoutArgs(this, &ClientSessionTest::StopClientSession)));
+
+  ConnectClientSession();
+  message_loop_.Run();
 }
 
 }  // namespace remoting
diff --git a/remoting/host/mouse_clamping_filter.cc b/remoting/host/mouse_clamping_filter.cc
index 04ee46c..3fdecbd 100644
--- a/remoting/host/mouse_clamping_filter.cc
+++ b/remoting/host/mouse_clamping_filter.cc
@@ -4,24 +4,34 @@
 
 #include "remoting/host/mouse_clamping_filter.h"
 
-#include "remoting/capturer/video_frame_capturer.h"
 #include "remoting/proto/event.pb.h"
+#include "remoting/proto/video.pb.h"
 
 namespace remoting {
 
-MouseClampingFilter::MouseClampingFilter(VideoFrameCapturer* capturer,
-                                         protocol::InputStub* input_stub)
-  : MouseInputFilter(input_stub), capturer_(capturer) {
+MouseClampingFilter::MouseClampingFilter(
+    protocol::InputStub* input_stub,
+    protocol::VideoStub* video_stub)
+    : input_filter_(input_stub),
+      video_stub_(video_stub) {
 }
 
 MouseClampingFilter::~MouseClampingFilter() {
 }
 
-void MouseClampingFilter::InjectMouseEvent(const protocol::MouseEvent& event) {
-  // Ensure that the MouseInputFilter is clamping to the current dimensions.
-  set_output_size(capturer_->size_most_recent());
-  set_input_size(capturer_->size_most_recent());
-  MouseInputFilter::InjectMouseEvent(event);
+void MouseClampingFilter::ProcessVideoPacket(
+    scoped_ptr<VideoPacket> video_packet,
+    const base::Closure& done) {
+  // Configure the MouseInputFilter to clamp to the video dimensions.
+  if (video_packet->format().has_screen_width() &&
+      video_packet->format().has_screen_height()) {
+    SkISize screen_size = SkISize::Make(video_packet->format().screen_width(),
+                                        video_packet->format().screen_height());
+    input_filter_.set_input_size(screen_size);
+    input_filter_.set_output_size(screen_size);
+  }
+
+  video_stub_->ProcessVideoPacket(video_packet.Pass(), done);
 }
 
 }  // namespace remoting
diff --git a/remoting/host/mouse_clamping_filter.h b/remoting/host/mouse_clamping_filter.h
index 02ff17a..9d8503cb 100644
--- a/remoting/host/mouse_clamping_filter.h
+++ b/remoting/host/mouse_clamping_filter.h
@@ -7,25 +7,30 @@
 
 #include "base/compiler_specific.h"
 #include "remoting/protocol/mouse_input_filter.h"
+#include "remoting/protocol/video_stub.h"
 
 namespace remoting {
 
-class VideoFrameCapturer;
-
-// Filtering InputStub implementation which clamps mouse each mouse event to
-// the current dimensions of a VideoFrameCapturer instance before passing
-// them on to the target |input_stub|.
-class MouseClampingFilter : public protocol::MouseInputFilter {
+// Filtering VideoStub implementation which configures a MouseInputFilter to
+// clamp mouse events to fall within the dimensions of the most-recently
+// received video frame.
+class MouseClampingFilter : public protocol::VideoStub {
  public:
-  MouseClampingFilter(VideoFrameCapturer* capturer,
-                      protocol::InputStub* input_stub);
+  MouseClampingFilter(protocol::InputStub* input_stub,
+                      protocol::VideoStub* video_stub);
   virtual ~MouseClampingFilter();
 
-  // InputStub overrides.
-  virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
+  protocol::InputStub* input_filter() { return &input_filter_; }
+
+  // protocol::VideoStub implementation.
+  virtual void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
+                                  const base::Closure& done) OVERRIDE;
 
  private:
-  VideoFrameCapturer* capturer_;
+  // Clamps mouse event coordinates to the video dimensions.
+  protocol::MouseInputFilter input_filter_;
+
+  protocol::VideoStub* video_stub_;
 
   DISALLOW_COPY_AND_ASSIGN(MouseClampingFilter);
 };