Add host-side rate-limiting to desktop resize events.

remoting/host/desktop_session_proxy.cc

 // 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 "remoting/host/desktop_session_proxy.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/platform_file.h"
 #include "base/process_util.h"
@@ skipping 16 matching lines @@
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/shared_memory.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_handle.h"
 #endif  // defined(OS_WIN)
 
 const bool kReadOnly = true;
 const char kSendInitialResolution[] = "sendInitialResolution";
+const char kRateLimitResizeRequests[] = "rateLimitResizeRequests";
 
 namespace remoting {
 
 class DesktopSessionProxy::IpcSharedBufferCore
     : public base::RefCountedThreadSafe<IpcSharedBufferCore> {
  public:
   IpcSharedBufferCore(int id,
                       base::SharedMemoryHandle handle,
                       base::ProcessHandle process,
                       size_t size)
@@ skipping 90 matching lines @@
   return scoped_ptr<ScreenControls>(new IpcScreenControls(this));
 }
 
 scoped_ptr<webrtc::ScreenCapturer> DesktopSessionProxy::CreateVideoCapturer() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   return scoped_ptr<webrtc::ScreenCapturer>(new IpcVideoFrameCapturer(this));
 }
 
 std::string DesktopSessionProxy::GetCapabilities() const {
-  // Ask the client to send it's resolution unconditionally.
-  return virtual_terminal_ ? kSendInitialResolution : std::string();
+  std::string result = kRateLimitResizeRequests;
+  // Ask the client to send its resolution unconditionally.
+  if (virtual_terminal_)
+    result = result + " " + kSendInitialResolution;
+  return result;
 }
 
 void DesktopSessionProxy::SetCapabilities(const std::string& capabilities) {
   // Delay creation of the desktop session until the client screen resolution is
   // received if the desktop session requires the initial screen resolution
   // (when |virtual_terminal_| is true) and the client is expected to
   // sent its screen resolution (the 'sendInitialResolution' capability is
   // supported).
   if (virtual_terminal_ &&
       HasCapability(capabilities, kSendInitialResolution)) {
@@ skipping 380 matching lines @@
 }
 
 // static
 void DesktopSessionProxyTraits::Destruct(
     const DesktopSessionProxy* desktop_session_proxy) {
   desktop_session_proxy->caller_task_runner_->DeleteSoon(FROM_HERE,
                                                          desktop_session_proxy);
 }
 
 }  // namespace remoting