Stops updating the status bubble position when the bubble is empty.

chrome/browser/ui/cocoa/status_bubble_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/status_bubble_mac.h"
 
 #include <limits>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 159 matching lines @@
 }
 
 void StatusBubbleMac::SetStatus(const base::string16& status) {
   SetText(status, false);
 }
 
 void StatusBubbleMac::SetURL(const GURL& url, const std::string& languages) {
   url_ = url;
   languages_ = languages;
 
-  NSRect frame = [window_ frame];
+  CGFloat bubble_width = NSWidth([window_ frame]);
 
   // Reset frame size when bubble is hidden.
   if (state_ == kBubbleHidden) {
     is_expanded_ = false;
-    frame.size.width = NSWidth(CalculateWindowFrame(/*expand=*/false));
+    NSRect frame = [window_ frame];
+    frame.size = ui::kWindowSizeDeterminedLater.size;
     [window_ setFrame:frame display:NO];
+    bubble_width = NSWidth(CalculateWindowFrame(/*expand=*/false));
   }
 
-  int text_width = static_cast<int>(NSWidth(frame) -
+  int text_width = static_cast<int>(bubble_width -
                                     kBubbleViewTextPositionX -
                                     kTextPadding);
 
   // Scale from view to window coordinates before eliding URL string.
   NSSize scaled_width = NSMakeSize(text_width, 0);
   scaled_width = [[parent_ contentView] convertSize:scaled_width fromView:nil];
   text_width = static_cast<int>(scaled_width.width);
   NSFont* font = [[window_ contentView] font];
   gfx::FontList font_list_chr(
       gfx::Font(base::SysNSStringToUTF8([font fontName]), [font pointSize]));
@@ skipping 53 matching lines @@
 
   bool show = true;
   if ([*main length] > 0)
     [[window_ contentView] setContent:*main];
   else if ([*backup length] > 0)
     [[window_ contentView] setContent:*backup];
   else
     show = false;
 
   if (show) {
+    // Call StartShowing() first to update the current bubble state before
+    // calculating a new size.
+    StartShowing();
     UpdateSizeAndPosition();
-    StartShowing();
   } else {
     StartHiding();
   }
 }
 
 void StatusBubbleMac::Hide() {
   CancelTimer();
   CancelExpandTimer();
   is_expanded_ = false;
 
   bool fade_out = false;
   if (state_ == kBubbleHidingFadeOut || state_ == kBubbleShowingFadeIn) {
     SetState(kBubbleHidingFadeOut);
 
     if (!immediate_) {
       // An animation is in progress.  Cancel it by starting a new animation.
       // Use kMinimumTimeInterval to set the opacity as rapidly as possible.
       fade_out = true;
       AnimateWindowAlpha(0.0, kMinimumTimeInterval);
     }
   }
 
+  NSRect frame = CalculateWindowFrame(/*expand=*/false);
   if (!fade_out) {
     // No animation is in progress, so the opacity can be set directly.
     [window_ setAlphaValue:0.0];
     SetState(kBubbleHidden);
+    frame.size = ui::kWindowSizeDeterminedLater.size;
   }
 
   // Stop any width animation and reset the bubble size.
   if (!immediate_) {
     [NSAnimationContext beginGrouping];
     [[NSAnimationContext currentContext] setDuration:kMinimumTimeInterval];
-    [[window_ animator] setFrame:CalculateWindowFrame(/*expand=*/false)
-                         display:NO];
+    [[window_ animator] setFrame:frame display:NO];
     [NSAnimationContext endGrouping];
   } else {
-    [window_ setFrame:CalculateWindowFrame(/*expand=*/false) display:NO];
+    [window_ setFrame:frame display:NO];
   }
 
   [status_text_ release];
   status_text_ = nil;
   [url_text_ release];
   url_text_ = nil;
 }
 
 void StatusBubbleMac::SetFrameAvoidingMouse(
     NSRect window_frame, const gfx::Point& mouse_pos) {
@@ skipping 398 matching lines @@
   [NSAnimationContext beginGrouping];
   [[NSAnimationContext currentContext] setDuration:kExpansionDurationSeconds];
   [[window_ animator] setFrame:actual_window_frame display:YES];
   [NSAnimationContext endGrouping];
 }
 
 void StatusBubbleMac::UpdateSizeAndPosition() {
   if (!window_)
     return;
 
+  // Hidden bubbles always have size equal to ui::kWindowSizeDeterminedLater.
+  if (state_ == kBubbleHidden) {
+    NSRect frame = [window_ frame];
+    frame.size = ui::kWindowSizeDeterminedLater.size;
+    [window_ setFrame:frame display:YES];
+    return;
+  }
+
   SetFrameAvoidingMouse(CalculateWindowFrame(/*expand=*/false),
                         GetMouseLocation());
 }
 
 void StatusBubbleMac::SwitchParentWindow(NSWindow* parent) {
   DCHECK(parent);
   DCHECK(is_attached());
 
   Detach();
   parent_ = parent;
@@ skipping 45 matching lines @@
     }
 
     // Round the top corners when the bubble is below the parent window.
     if (NSMinY(window_frame) < NSMinY(parent_frame)) {
       corner_flags |= kRoundedTopLeftCorner | kRoundedTopRightCorner;
     }
   }
 
   return corner_flags;
 }