Add CVC icon to card unmasking prompt

chrome/android/java/res/layout/autofill_card_unmask_prompt.xml

Index: chrome/android/java/res/layout/autofill_card_unmask_prompt.xml
diff --git a/ui/android/java/res/layout/autofill_card_unmask_prompt.xml b/chrome/android/java/res/layout/autofill_card_unmask_prompt.xml
similarity index 90%
rename from ui/android/java/res/layout/autofill_card_unmask_prompt.xml
rename to chrome/android/java/res/layout/autofill_card_unmask_prompt.xml
index 360e2169200b159454ba77d8781667111c0bfb9b..75b685ffc2794dbb55ca1b826a7fd8b42d25c6b2 100644
--- a/ui/android/java/res/layout/autofill_card_unmask_prompt.xml
+++ b/chrome/android/java/res/layout/autofill_card_unmask_prompt.xml
@@ -46,11 +46,18 @@
             android:inputType="number"
             android:layout_height="wrap_content"
             android:layout_width="wrap_content"
-            android:layout_marginStart="16dp"
-            android:layout_marginEnd="16dp"
             android:ems="4"

[newt (away), 2015/01/31 01:42:48]

nit: put ems after layout_marginStart. layout_* attributes should come before
everything except the id.

[Evan Stade, 2015/01/31 02:09:58]

Done.

+            android:layout_marginStart="16dp"
             android:hint="@string/card_unmask_input_hint" />
 
+        <ImageView
+            android:id="@+id/cvc_hint_image"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginStart="8dp"
+            android:layout_marginEnd="16dp" />
+
         <ProgressBar
             style="@android:style/Widget.ProgressBar.Small"
             android:id="@+id/verification_progress_bar"