MacViews: Anchor bubbles according to the MD spec.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
index 7ff80b10a00d55880e8f95ed861a88da79901032..5fe826d00caa76757ce73e45d710b982fc26a091 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
@@ -284,9 +284,23 @@ const CGFloat kAnimationDuration = 0.2;
 }
 
 - (NSPoint)bubblePointForDecoration:(LocationBarDecoration*)decoration {
-  const NSRect frame =
-      [[self cell] frameForDecoration:decoration inFrame:[self bounds]];
-  const NSPoint point = decoration->GetBubblePointInFrame(frame);
+  NSPoint point;
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
+    // Under MD, dialogs have no arrow and anchor to corner of the decoration
+    // frame, not a specific point within it. See http://crbug.com/566115.
+    BOOL isLeftDecoration;
+    const NSRect frame =
+        [[self cell] backgroundFrameForDecoration:decoration
+                                          inFrame:[self bounds]
+                                 isLeftDecoration:&isLeftDecoration];
+    point.y = NSMaxY(frame);
+    point.x = isLeftDecoration ? NSMinX(frame) : NSMaxX(frame);
+  } else {
+    const NSRect frame =
+        [[self cell] frameForDecoration:decoration inFrame:[self bounds]];
+    point = decoration->GetBubblePointInFrame(frame);
+  }
+
   return [self convertPoint:point toView:nil];
 }