Show the Mac app launcher window with a spinner while loading Chrome.

ui/app_list/cocoa/app_list_view_controller.mm

 // Copyright 2013 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.
 
 #import "ui/app_list/cocoa/app_list_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "skia/ext/skia_utils_mac.h"
@@ skipping 142 matching lines @@
 - (NSView*)backgroundView {
   return backgroundView_;
 }
 
 - (app_list::AppListViewDelegate*)delegate {
   return delegate_.get();
 }
 
 - (void)setDelegate:(scoped_ptr<app_list::AppListViewDelegate>)newDelegate {
   if (delegate_) {
+    // Ensure the search box is cleared when switching profiles.
+    if ([self searchBoxModel])
+      [self searchBoxModel]->SetText(base::string16());
+
     // First clean up, in reverse order.
     app_list_model_observer_bridge_.reset();
     [appsSearchResultsController_ setDelegate:nil];
     [appsSearchBoxController_ setDelegate:nil];
     [appsGridController_ setDelegate:nil];
   }
   delegate_.reset(newDelegate.release());
-  if (!delegate_)
+  if (delegate_) {
+    [loadingIndicator_ stopAnimation:self];
+  } else {
+    [loadingIndicator_ startAnimation:self];
     return;
+  }
+
   [appsGridController_ setDelegate:delegate_.get()];
   [appsSearchBoxController_ setDelegate:self];
   [appsSearchResultsController_ setDelegate:self];
   app_list_model_observer_bridge_.reset(
       new app_list::AppListModelObserverBridge(self));
   [self onProfilesChanged];
 }
 
 -(void)loadAndSetView {
   pagerControl_.reset([[AppListPagerView alloc] init]);
@@ skipping 11 matching lines @@
               NSMakeRect(0, 0, NSMaxX(contentsRect), NSMaxY(contentsRect))]);
   appsSearchBoxController_.reset(
       [[AppsSearchBoxController alloc] initWithFrame:
           NSMakeRect(0, 0, NSWidth(contentsRect), kSearchInputHeight)]);
   appsSearchResultsController_.reset(
       [[AppsSearchResultsController alloc] initWithAppsSearchResultsFrameSize:
           [contentsView_ bounds].size]);
   base::scoped_nsobject<NSView> containerView(
       [[NSView alloc] initWithFrame:[backgroundView_ frame]]);
 
+  loadingIndicator_.reset(
+      [[NSProgressIndicator alloc] initWithFrame:NSZeroRect]);
+  [loadingIndicator_ setStyle:NSProgressIndicatorSpinningStyle];
+  [loadingIndicator_ sizeToFit];
+  NSRect indicatorRect = [loadingIndicator_ frame];
+  indicatorRect.origin.x = NSWidth(contentsRect) / 2 - NSMidX(indicatorRect);
+  indicatorRect.origin.y = NSHeight(contentsRect) / 2 - NSMidY(indicatorRect);
+  [loadingIndicator_ setFrame:indicatorRect];
+  [loadingIndicator_ setDisplayedWhenStopped:NO];
+  [loadingIndicator_ startAnimation:self];
+
   [contentsView_ addSubview:[appsGridController_ view]];
   [contentsView_ addSubview:pagerControl_];
+  [contentsView_ addSubview:loadingIndicator_];
   [backgroundView_ addSubview:contentsView_];
   [backgroundView_ addSubview:[appsSearchResultsController_ view]];
   [backgroundView_ addSubview:[appsSearchBoxController_ view]];
   [containerView addSubview:backgroundView_];
   [self setView:containerView];
 }
 
 - (void)revealSearchResults:(BOOL)show {
   if (show == showingSearchResults_)
     return;
@@ skipping 130 matching lines @@
 
   [backgroundView_ setHidden:YES];
   signinViewController_.reset(
       [[SigninViewController alloc] initWithFrame:[backgroundView_ frame]
                                      cornerRadius:kBubbleCornerRadius
                                          delegate:signinDelegate]);
   [[self view] addSubview:[signinViewController_ view]];
 }
 
 @end