Adding search widget UI and functionality.

ios/chrome/search_widget_extension/search_widget_view.h

Index: ios/chrome/search_widget_extension/search_widget_view.h
diff --git a/ios/chrome/search_widget_extension/search_widget_view.h b/ios/chrome/search_widget_extension/search_widget_view.h
index d9f145c603f642cb721743b96ca1aef623e16634..43959791fde0da8eb70b8733575dbd95ea1312f2 100644
--- a/ios/chrome/search_widget_extension/search_widget_view.h
+++ b/ios/chrome/search_widget_extension/search_widget_view.h
@@ -28,9 +28,15 @@
 // calls the target when tapped.
 @interface SearchWidgetView : UIView
 
+// Set this property to show/hide the copied URL section.
+@property(nonatomic) BOOL copiedURLVisible;
+
 // Designated initializer, creates the widget view with a |target| for user
-// actions.
+// actions. View elements will be added to the |primaryVibrancyEffect| and
+// |secondaryVibrancyEffect| views.
 - (instancetype)initWithActionTarget:(id<SearchWidgetViewActionTarget>)target
+               primaryVibrancyEffect:(UIVibrancyEffect*)primaryVibrancyEffect
+             secondaryVibrancyEffect:(UIVibrancyEffect*)secondaryVibrancyEffect
     NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
 - (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;