Add a tray notification UI for speech input recording in the extension API.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 828124751c9edeb5c2faff1f51658d42b4174d32..f12037a86081fe54205683659f8cae0f7f78fa29 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14289,6 +14289,15 @@ Keep your key file in a safe place. You will need it to create new versions of y
     <message name="IDS_SPEECH_INPUT_MIC_SETTINGS" desc="Text displayed on a button or link to open the microphone settings window.">
       Microphone settings
     </message>
+    <message name="IDS_SPEECH_INPUT_TRAY_TOOLTIP" desc="Tool tip for the recording notification icon shown by the speech input extension API">
+      <ph name="PRODUCT_NAME">$2<ex>Google Chrome</ex></ph> extension "<ph name="EXTENSION_NAME">$1<ex>Speech Recognizer</ex></ph>" is currently recording audio for speech recognition.
+    </message>
+    <message name="IDS_SPEECH_INPUT_TRAY_BALLOON_TITLE" desc="Title of the balloon shown by the tray notification icon the first time a extension starts recording using the speech input extension API">
+      Audio recording started.
+    </message>
+    <message name="IDS_SPEECH_INPUT_TRAY_BALLOON_BODY" desc="Contents of the balloon shown by the tray notification icon the first time a extension starts recording using the speech input extension API">
+      <ph name="PRODUCT_NAME">$2<ex>Google Chrome</ex></ph> extension "<ph name="EXTENSION_NAME">$1<ex>Speech Recognizer</ex></ph>" has started recording audio for speech recognition. Look for the microphone tray icon to know when this happens again.
+    </message>
 
     <message name="IDS_IMAGE_FILES" desc="The description of the image file extensions in the select file dialog.">
       Image Files