Adds chromium side plumbing to pass speech input calls back and forth with WebKit.

Please advise if any of the code needs to be within "#if ENABLE_INPUT_SPEECH", since most of the speech input code in webkit is under "#if ENABLE(INPUT_SPEECH)"

- Created renderer/SpeechInputDispatcher, implements WebKit::WebSpeechInputController which is used by WebView for invoking speech input.
- Created browser/speech/SpeechInputDispatcherHost to receive IPC messages from the above SpeechInputDispatcher. Nothing done yet apart from receiving the messages.
- Creates new directory chrome/browser/speech, this will be used for SpeechInputDispatcherHost, network based speech recognizer, speech audio recording/buffering code as well as  speech output (Text-to-speech) code in future.

BUG=none
TEST=no functionality to test yet.

Review URL: http://codereview.chromium.org/3035035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54981 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 31 insertions, 0 deletions

diff --git a/chrome/common/render_messages_internal.h b/chrome/common/render_messages_internal.h
index 76d2585..66ce013 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -976,6 +976,19 @@ IPC_BEGIN_MESSAGES(View)
   IPC_MESSAGE_ROUTED1(ViewMsg_AccessibilityDoDefaultAction,
                       int /* object id */)
 
+  // Relay a speech recognition result, either partial or final.
+  IPC_MESSAGE_ROUTED1(ViewMsg_SpeechInput_SetRecognitionResult,
+                      string16 /* result */)
+
+  // Indicate that speech recognizer has stopped recording and started
+  // recognition.
+  IPC_MESSAGE_ROUTED0(ViewMsg_SpeechInput_RecordingComplete)
+
+  // Indicate that speech recognizer has completed recognition. This will be
+  // the last message sent in response to a
+  // ViewHostMsg_SpeechInput_StartRecognition.
+  IPC_MESSAGE_ROUTED0(ViewMsg_SpeechInput_RecognitionComplete)
+
 IPC_END_MESSAGES(View)
 
 
@@ -2539,4 +2552,22 @@ IPC_BEGIN_MESSAGES(ViewHost)
   // This allows the browser to handle things such as zooming differently.
   IPC_MESSAGE_ROUTED0(ViewHostMsg_SetDisplayingPDFContent)
 
+  // Requests the speech input service to start speech recognition on behalf of
+  // the given |render_view_id|.
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_SpeechInput_StartRecognition,
+                       int /* render_view_id */)
+
+  // Requests the speech input service to cancel speech recognition on behalf of
+  // the given |render_view_id|. If speech recognition is not happening nor or
+  // is happening on behalf of some other render view, this call does nothing.
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_SpeechInput_CancelRecognition,
+                       int /* render_view_id */)
+
+  // Requests the speech input service to stop audio recording on behalf of
+  // the given |render_view_id|. Any audio recorded so far will be fed to the
+  // speech recognizer. If speech recognition is not happening nor or is
+  // happening on behalf of some other render view, this call does nothing.
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_SpeechInput_StopRecording,
+                       int /* render_view_id */)
+
 IPC_END_MESSAGES(ViewHost)