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 a2952039b42c22629a30f2bda87fd7fa038feef4..ac7c3113bf74c45f8bcfa1d8fbd0a7f5161a10b6 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
@@ -299,9 +299,23 @@ 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];
 }