[Mac] Implement the basic zoom bubble.

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 2d901fcaf18cf953b1745e579b42e8d6216cac39..ccd097cd74de74122946f091379047eecbfb5e58 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7725,9 +7725,16 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_TOOLTIP_ZOOM" desc="The tooltip for zoom icon">
         Zoom: <ph name="VALUE">$1<ex>100</ex></ph>%
       </message>
-      <message name="IDS_ZOOM_SET_DEFAULT" desc="The text label of a button which, when clicked, returns the page to default zoom">
-        Reset to default
-      </message>
+      <if expr="not pp_ifdef('use_titlecase')">
+        <message name="IDS_ZOOM_SET_DEFAULT" desc="The text label of a button which, when clicked, returns the page to default zoom">
+          Reset to default
+        </message>
+      </if>
+      <if expr="pp_ifdef('use_titlecase')">
+        <message name="IDS_ZOOM_SET_DEFAULT" desc="In Title Case: The text label of a button which, when clicked, returns the page to default zoom">
+          Reset to Default
+        </message>
+      </if>
 
       <!--Action Box menu-->
       <message name="IDS_BOOKMARK_STAR" desc="The text for bookmark menu item">