[Cocoa] Make TabContentsContainerView more testable for interactive_ui_tests.

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.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.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include <utility>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #import "chrome/browser/themes/theme_properties.h"
 #import "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
+#include "chrome/browser/ui/view_ids.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/gfx/geometry/rect.h"
 
 using content::WebContents;
 using content::WebContentsObserver;
 
@@ skipping 133 matching lines @@
   const NSInteger numberOfComponents = [nsBackgroundColor numberOfComponents];
   CGFloat components[numberOfComponents];
   [nsBackgroundColor getComponents:components];
   base::ScopedCFTypeRef<CGColorRef> cgBackgroundColor(
       CGColorCreate(cgColorSpace, components));
 
   ScopedCAActionDisabler disabler;
   [[self layer] setBackgroundColor:cgBackgroundColor];
 }
 
+- (ViewID)viewID {
+  return VIEW_ID_TAB_CONTAINER;
+}
+
+- (BOOL)acceptsFirstResponder {
+  return [[self subviews] count] > 0 &&
+      [[[self subviews] objectAtIndex:0] acceptsFirstResponder];
+}
+
+// When receiving a click-to-focus in the solid color area surrounding the
+// WebContents' native view, immediately transfer focus to WebContents' native
+// view.
+- (BOOL)becomeFirstResponder {
+  if (![self acceptsFirstResponder])
+    return NO;
+  return [[self window] makeFirstResponder:[[self subviews] objectAtIndex:0]];
+}
+
+- (BOOL)canBecomeKeyView {
+  return NO;  // Tab/Shift-Tab should focus the subview, not this view.
+}
+
 @end  // @implementation TabContentsContainerView
 
 @implementation TabContentsController
 @synthesize webContents = contents_;
 
 - (id)initWithContents:(WebContents*)contents {
   if ((self = [super initWithNibName:nil bundle:nil])) {
     fullscreenObserver_.reset(new FullscreenObserver(self));
     [self changeWebContents:contents];
   }
@@ skipping 159 matching lines @@
     } else {
       rect.ClampToCenteredSize(gfx::Size(
           static_cast<int>(x / captureSize.height()), rect.height()));
     }
   }
 
   return NSRectFromCGRect(rect.ToCGRect());
 }
 
 @end