Add a ProgressDialog during sign-in flow when GMS is updated.

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

Index: chrome/android/java/res/layout/account_signin_view.xml
diff --git a/chrome/android/java/res/layout/account_signin_view.xml b/chrome/android/java/res/layout/account_signin_view.xml
index 646127e63cb8c636cde2667898755193624ca6d8..a273840e01203bd82e78f4e1ec33b0da8ee29432 100644
--- a/chrome/android/java/res/layout/account_signin_view.xml
+++ b/chrome/android/java/res/layout/account_signin_view.xml
@@ -32,7 +32,7 @@
                 android:orientation="vertical">
 
                 <!-- The layout_width/layout_height is set to 16/9 dynamically in Java -->
-                <TextView 
+                <TextView
                     android:id="@+id/signin_title"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ -45,13 +45,13 @@
                     android:textSize="@dimen/fre_title_text_size"
                     android:text="@string/sign_in_to_chrome"/>
 
-                <View 
+                <View
                     android:layout_width="match_parent"
                     android:layout_height="1dp"
                     android:background="@color/signin_border_line_color"
                     android:alpha="0.08"/>
 
-                <TextView 
+                <TextView
                     android:id="@+id/signin_choice_description"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"