[Mac]Implement ViewID support.

chrome/browser/cocoa/tab_strip_controller.mm

 // Copyright (c) 2010 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/cocoa/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <limits>
 #include <string>
@@ skipping 635 matching lines @@
 // Returns YES if the specificed command should be enabled for the given
 // controller.
 - (BOOL)isCommandEnabled:(TabStripModel::ContextMenuCommand)command
            forController:(TabController*)controller {
   int index = [self modelIndexForTabView:[controller view]];
   if (!tabStripModel_->ContainsIndex(index))
     return NO;
   return tabStripModel_->IsContextMenuCommandEnabled(index, command) ? YES : NO;
 }
 
+// Returns the index of the tab controller. Returns -1 if not present.
+// Unlike modelIndexForTabView, this method does not care about whether the tab
+// is closing or not.
+- (NSInteger)indexForTabController:(TabController*)controller
+                           inTotal:(NSInteger*)total {
+  if (total)
+    *total = [tabArray_ count];
+  NSInteger index = 0;
+  for (TabController* current in tabArray_.get()) {
+    if (current  == controller)
+      return index;
+    ++index;
+  }
+  return -1;
+}
+
 - (void)insertPlaceholderForTab:(TabView*)tab
                           frame:(NSRect)frame
                   yStretchiness:(CGFloat)yStretchiness {
   placeholderTab_ = tab;
   placeholderFrame_ = frame;
   placeholderStretchiness_ = yStretchiness;
   [self layoutTabsWithAnimation:initialLayoutComplete_ regenerateSubviews:NO];
 }
 
 - (BOOL)isTabFullyVisible:(TabView*)tab {
@@ skipping 1145 matching lines @@
     return;
 
   TabContentsController* tabController =
       [tabContentsArray_ objectAtIndex:index];
   TabContents* devtoolsContents = contents ?
       DevToolsWindow::GetDevToolsContents(contents) : NULL;
   [tabController showDevToolsContents:devtoolsContents];
 }
 
 @end