Lessen the difference in appearance of title bar during load.

Change to using textfield_search_empty assets, which have margin
values that better match the assets used outside of a load.  As
a result, there is no longer a need to edit the LayoutParams in
TitleBar.java.  However, do set the padding in TitleBar.java, since
it needs to be set for each of the different backgrounds used.

Fixes http://b/issue?id=2558919

Change-Id: Idf0d8bea59bcc76c32e1e03bf736a4b64bf31887
diff --git a/res/drawable/title_text.xml b/res/drawable/title_text.xml
index 6a214d9..b435e4d 100644
--- a/res/drawable/title_text.xml
+++ b/res/drawable/title_text.xml
@@ -18,7 +18,7 @@
         pressed state even without window focus -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true"
-            android:drawable="@*android:drawable/textfield_pressed" />
+            android:drawable="@*android:drawable/textfield_search_empty_pressed" />
     <item android:state_pressed="false"
-            android:drawable="@*android:drawable/textfield_default" />
+            android:drawable="@*android:drawable/textfield_search_empty_default" />
 </selector>