In speech input, introduce a 'warm up' screen for slow audio capture devices.

In some hardware/OS configurations it takes several hundred milliseconds to seconds for the audio driver
to get initialised and start giving audio to the application. We start by showing an empty bubble and if
audio was received within 500ms the usual volume meter becomes visible. If audio data was not received
within 500ms we start showing a light gray spinner animation to signal that things aren't ready yet to
start speaking.

BUG=61677
TEST=unit_tests and browser_tests with --gtest_filter=Speech*

Review URL: http://codereview.chromium.org/6720031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80417 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 1 deletions

diff --git a/chrome/browser/speech/speech_input_bubble_controller.h b/chrome/browser/speech/speech_input_bubble_controller.h
index c690fae..c09f184 100644
--- a/chrome/browser/speech/speech_input_bubble_controller.h
+++ b/chrome/browser/speech/speech_input_bubble_controller.h
@@ -55,6 +55,10 @@ class SpeechInputBubbleController
                     int render_view_id,
                     const gfx::Rect& element_rect);
 
+  // Indicates to the user that audio hardware is warming up. This also makes
+  // the bubble visible if not already visible.
+  void SetBubbleWarmUpMode(int caller_id);
+
   // Indicates to the user that audio recording is in progress. This also makes
   // the bubble visible if not already visible.
   void SetBubbleRecordingMode(int caller_id);
@@ -84,6 +88,7 @@ class SpeechInputBubbleController
  private:
   // The various calls received by this object and handled in the UI thread.
   enum RequestType {
+    REQUEST_SET_WARM_UP_MODE,
     REQUEST_SET_RECORDING_MODE,
     REQUEST_SET_RECOGNIZING_MODE,
     REQUEST_SET_MESSAGE,
@@ -116,7 +121,7 @@ class SpeechInputBubbleController
   // Only accessed in the IO thread.
   Delegate* delegate_;
 
-  //*** The following are accessed only in the UI thread.
+  // *** The following are accessed only in the UI thread.
 
   // The caller id for currently visible bubble (since only one bubble is
   // visible at any time).