[Android] Upstream the WebView find-in-page API implementation.

content/browser/renderer_host/render_process_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/process.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/timer.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_process_host.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ui/surface/transport_dib.h"
 
 class CommandLine;
 
 namespace gfx {
@@ skipping 262 matching lines @@
   // the same process doesn't.
   bool sudden_termination_allowed_;
 
   // Set to true if we shouldn't send input events.  We actually do the
   // filtering for this at the render widget level.
   bool ignore_input_events_;
 
   // Records the last time we regarded the child process active.
   base::TimeTicks child_process_activity_time_;
 
+#if defined(OS_ANDROID)
+  // Android WebView needs to use a SyncChannel to block the browser process
+  // for synchronous find-in-page API support. In that case the shutdown event
+  // makes no sense but SyncChannel still expects one. So, create a dummy event

[jam, 2012/09/19 16:55:43]

why doesn't it make sense? seems that you'd want to set this when the user
attempts to quit (or the system asks you to?) so that the sync call can be
cancelled? or is this moot because there's no quitting on android?

[Leandro Graciá Gil, 2012/09/19 18:08:59]

AFAIK there's no quitting on Android, we just get killed. Same goes for the
WebView case. I'll be updating the comment to make this clear.

+  // that never will be signaled.
+  base::WaitableEvent dummy_shutdown_event_;
+#endif
+
   // Indicates whether this is a RenderProcessHost of a Browser Plugin guest
   // renderer.
   bool is_guest_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_