Mac: implement drag-and-drop of URLs to tabs/tab strip.

chrome/browser/cocoa/tab_strip_view.mm

Index: chrome/browser/cocoa/tab_strip_view.mm
diff --git a/chrome/browser/cocoa/tab_strip_view.mm b/chrome/browser/cocoa/tab_strip_view.mm
index f2638dce6b7bf9886e3769a4007a3b55f91abe3c..1dcd7469133e8fb49dfa690bed5532d4c76cf30c 100644
--- a/chrome/browser/cocoa/tab_strip_view.mm
+++ b/chrome/browser/cocoa/tab_strip_view.mm
@@ -16,6 +16,9 @@
     // Set lastMouseUp_ = -1000.0 so that timestamp-lastMouseUp_ is big unless
     // lastMouseUp_ has been reset.
     lastMouseUp_ = -1000.0;
+
+    // Register to be an URL drop target.
+    dropHandler_.reset([[URLDropTargetHandler alloc] initWithView:self]);
   }
   return self;
 }
@@ -72,4 +75,24 @@
   lastMouseUp_ = (clickCount == 1) ? timestamp : -1000.0;
 }
 
+// Required by |URLDropTargetHandler|.
+- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
+  return [dropHandler_ draggingEntered:sender];
+}
+
+// Required by |URLDropTargetHandler|.
+- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
+  return [dropHandler_ draggingUpdated:sender];
+}
+
+// Required by |URLDropTargetHandler|.
+- (void)draggingExited:(id<NSDraggingInfo>)sender {
+  return [dropHandler_ draggingExited:sender];
+}
+
+// Required by |URLDropTargetHandler|.
+- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
+  return [dropHandler_ performDragOperation:sender];
+}
+
 @end