RenderWidget popup should be a NSWindow so it can go outside the main window.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index ee7d3ed8360d1db13540b4c3dffe0caa84ed0fd9..7bbf0434958650a3c712fb2c993b5e0f60917517 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -47,6 +47,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebScreenInfoFactory.h"
 #import "third_party/mozilla/ComplexTextInputPanel.h"
 #include "third_party/skia/include/core/SkColor.h"
+#import "ui/base/cocoa/event_hook_application.h"
 #import "ui/base/cocoa/fullscreen_window_manager.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
 #include "ui/base/keycodes/keyboard_codes.h"
@@ -137,7 +138,6 @@ static float ScaleFactor(NSView* view) {
 - (void)scrollOffsetPinnedToLeft:(BOOL)left toRight:(BOOL)right;
 - (void)setHasHorizontalScrollbar:(BOOL)has_horizontal_scrollbar;
 - (void)keyEvent:(NSEvent*)theEvent wasKeyEquivalent:(BOOL)equiv;
-- (void)cancelChildPopups;
 - (void)windowDidChangeBackingProperties:(NSNotification*)notification;
 - (void)windowChangedGlobalFrame:(NSNotification*)notification;
 - (void)checkForPluginImeCancellation;
@@ -167,6 +167,74 @@ static const short kIOHIDEventTypeScroll = 6;
 
 @end
 
+@interface RenderWidgetPopupWindow : NSWindow<CrEventHookProtocol>
+@end
+
+@implementation RenderWidgetPopupWindow
+
+- (id)initWithContentRect:(NSRect)contentRect
+                styleMask:(NSUInteger)windowStyle
+                  backing:(NSBackingStoreType)bufferingType
+                    defer:(BOOL)deferCreation {
+  if (self = [super initWithContentRect:contentRect
+                              styleMask:windowStyle
+                                backing:bufferingType
+                                  defer:deferCreation]) {
+    [self setOpaque:NO];
+    [self setBackgroundColor:[NSColor clearColor]];
+    [self startObservingClicks];
+  }
+  return self;
+}
+
+- (void)close {
+  [self stopObservingClicks];
+  [super close];
+}
+
+// Gets called for all events in application. Watching for a click outside the
+// window so we can close.
+- (void)hookForEvent:(NSEvent*)theEvent {
+  if ([theEvent window] == self)
+    return;
+  NSEventType eventType = [theEvent type];
+  if (eventType == NSLeftMouseDown || eventType == NSRightMouseDown)
+    [self close];
+}
+
+// Gets called when the menubar is clicked.
+// Needed because the hookForEvent method doesn't see the click on the menubar.
+- (void)begunTracking:(NSNotification*)notification {
+  [self close];
+}
+
+// Install the callback.
+- (void)startObservingClicks {
+  CrEventHookApplication* app = static_cast<CrEventHookApplication*>(
+      [CrEventHookApplication sharedApplication]);
+  [app addEventHook:self];
+
+  NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
+  [nc addObserver:self
+         selector:@selector(begunTracking:)
+             name:NSMenuDidBeginTrackingNotification
+           object:[NSApp mainMenu]];
+}
+
+// Remove the callback.
+- (void)stopObservingClicks {
+  CrEventHookApplication* app = static_cast<CrEventHookApplication*>(
+      [CrEventHookApplication sharedApplication]);
+  [app removeEventHook:self];
+
+  NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
+  [nc removeObserver:self
+                name:NSMenuDidBeginTrackingNotification
+              object:[NSApp mainMenu]];
+}
+
+@end
+
 namespace {
 
 // Maximum number of characters we allow in a tooltip.
@@ -334,22 +402,30 @@ void RenderWidgetHostViewMac::InitAsPopup(
   bool activatable = popup_type_ == WebKit::WebPopupTypeNone;
   [cocoa_view_ setCloseOnDeactivate:YES];
   [cocoa_view_ setCanBeKeyView:activatable ? YES : NO];
-  [parent_host_view->GetNativeView() addSubview:cocoa_view_];
 
   NSPoint origin_global = NSPointFromCGPoint(pos.origin().ToCGPoint());
   if ([[NSScreen screens] count] > 0) {
     origin_global.y = [[[NSScreen screens] objectAtIndex:0] frame].size.height -
         pos.height() - origin_global.y;
   }
-  NSPoint origin_window =
-      [[cocoa_view_ window] convertScreenToBase:origin_global];
-  NSPoint origin_view =
-      [cocoa_view_ convertPoint:origin_window fromView:nil];
-  NSRect initial_frame = NSMakeRect(origin_view.x,
-                                    origin_view.y,
-                                    pos.width(),
-                                    pos.height());
-  [cocoa_view_ setFrame:initial_frame];
+
+  popup_window_.reset([[RenderWidgetPopupWindow alloc]
+      initWithContentRect:NSMakeRect(origin_global.x, origin_global.y,
+                                     pos.width(), pos.height())
+                styleMask:NSBorderlessWindowMask
+                  backing:NSBackingStoreBuffered
+                    defer:NO]);
+  [popup_window_ setLevel:NSPopUpMenuWindowLevel];
+  [popup_window_ setReleasedWhenClosed:NO];
+  [popup_window_ makeKeyAndOrderFront:nil];
+  [[popup_window_ contentView] addSubview:cocoa_view_];
+  [cocoa_view_ setFrame:[[popup_window_ contentView] bounds]];
+  [cocoa_view_ setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+  [[NSNotificationCenter defaultCenter]
+      addObserver:cocoa_view_
+         selector:@selector(popupWindowWillClose:)
+             name:NSWindowWillCloseNotification
+           object:popup_window_];
 }
 
 // This function creates the fullscreen window and hides the dock and menubar if
@@ -458,24 +534,17 @@ void RenderWidgetHostViewMac::SetBounds(const gfx::Rect& rect) {
     // The position of |rect| is screen coordinate system and we have to
     // consider Cocoa coordinate system is upside-down and also multi-screen.
     NSPoint origin_global = NSPointFromCGPoint(rect.origin().ToCGPoint());
+    NSSize size = NSMakeSize(rect.width(), rect.height());
+    size = [cocoa_view_ convertSize:size toView:nil];
     if ([[NSScreen screens] count] > 0) {
-      NSSize size = NSMakeSize(rect.width(), rect.height());
-      size = [cocoa_view_ convertSize:size toView:nil];
       NSScreen* screen =
           static_cast<NSScreen*>([[NSScreen screens] objectAtIndex:0]);
       origin_global.y =
           NSHeight([screen frame]) - size.height - origin_global.y;
     }
-
-    // Then |origin_global| is converted to client coordinate system.
-    DCHECK([cocoa_view_ window]);
-    NSPoint origin_window =
-        [[cocoa_view_ window] convertScreenToBase:origin_global];
-    NSPoint origin_view =
-        [[cocoa_view_ superview] convertPoint:origin_window fromView:nil];
-    NSRect frame = NSMakeRect(origin_view.x, origin_view.y,
-                              rect.width(), rect.height());
-    [cocoa_view_ setFrame:frame];
+    [popup_window_ setFrame:NSMakeRect(origin_global.x, origin_global.y,
+                                       size.width, size.height)
+                    display:YES];
   } else {
     DCHECK([[cocoa_view_ superview] isKindOfClass:[BaseView class]]);
     BaseView* superview = static_cast<BaseView*>([cocoa_view_ superview]);
@@ -705,31 +774,26 @@ void RenderWidgetHostViewMac::RenderViewGone(base::TerminationStatus status,
 void RenderWidgetHostViewMac::Destroy() {
   AckPendingSwapBuffers();
 
-  // On Windows, popups are implemented with a popup window style, so that when
-  // an event comes in that would "cancel" it, it receives the OnCancelMode
-  // message and can kill itself. Alas, on the Mac, views cannot capture events
-  // outside of themselves. On Windows, if Destroy is being called on a view,
-  // then the event causing the destroy had also cancelled any popups by the
-  // time Destroy() was called. On the Mac we have to destroy all the popups
-  // ourselves.
-
-  // Depth-first destroy all popups. Use ShutdownHost() to enforce
-  // deepest-first ordering.
   for (NSView* subview in [cocoa_view_ subviews]) {
-    if ([subview isKindOfClass:[RenderWidgetHostViewCocoa class]]) {
-      [static_cast<RenderWidgetHostViewCocoa*>(subview)
-          renderWidgetHostViewMac]->ShutdownHost();
-    } else if ([subview isKindOfClass:[AcceleratedPluginView class]]) {
+    if ([subview isKindOfClass:[AcceleratedPluginView class]]) {
       [static_cast<AcceleratedPluginView*>(subview)
           onRenderWidgetHostViewGone];
     }
   }
 
+  [[NSNotificationCenter defaultCenter]
+      removeObserver:cocoa_view_
+                name:NSWindowWillCloseNotification
+              object:popup_window_];
+
   // We've been told to destroy.
   [cocoa_view_ retain];
   [cocoa_view_ removeFromSuperview];
   [cocoa_view_ autorelease];
 
+  [popup_window_ close];
+  popup_window_.autorelease();
+
   [fullscreen_window_manager_ exitFullscreenMode];
   fullscreen_window_manager_.reset();
   [pepper_fullscreen_window_ close];
@@ -2086,10 +2150,6 @@ void RenderWidgetHostViewMac::SetTextInputActive(bool active) {
 }
 
 - (void)scrollWheel:(NSEvent*)theEvent {
-  // Cancel popups before calling the delegate because even if the delegate eats
-  // the event, it's still an explicit user action outside the popup.
-  [self cancelChildPopups];
-
   if (delegate_ && [delegate_ respondsToSelector:@selector(handleEvent:)]) {
     BOOL handled = [delegate_ handleEvent:theEvent];
     if (handled)
@@ -2102,23 +2162,6 @@ void RenderWidgetHostViewMac::SetTextInputActive(bool active) {
     renderWidgetHostView_->render_widget_host_->ForwardWheelEvent(event);
 }
 
-// See the comment in RenderWidgetHostViewMac::Destroy() about cancellation
-// events. On the Mac we must kill popups on outside events, thus this lovely
-// case of filicide caused by events on parent views.
-- (void)cancelChildPopups {
-  // If this view can be the key view, it is not a popup. Therefore, if it has
-  // any children, they are popups that need to be canceled.
-  if (canBeKeyView_) {
-    for (NSView* subview in [self subviews]) {
-      if (![subview isKindOfClass:[RenderWidgetHostViewCocoa class]])
-        continue;  // Skip plugin views.
-
-      [static_cast<RenderWidgetHostViewCocoa*>(subview)
-          renderWidgetHostViewMac]->KillSelf();
-    }
-  }
-}
-
 - (void)viewWillMoveToWindow:(NSWindow*)newWindow {
   // We're messing with the window, so do this to ensure no flashes. This one
   // prevents a flash when the current tab is closed.
@@ -3337,6 +3380,10 @@ extern NSString *NSTextInputReplacementRangeAttributeName;
   [[self window] invalidateCursorRectsForView:self];
 }
 
+- (void)popupWindowWillClose:(NSNotification *)notification {
+  renderWidgetHostView_->KillSelf();
+}
+
 @end
 
 //