Fix the misalignment on CrOS of the tab background images

chrome/browser/ui/cocoa/tabs/tab_strip_view.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/tabs/tab_strip_view.h"
 
 #include <cmath>  // floor
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
@@ skipping 38 matching lines @@
   ThemeService* themeProvider =
       static_cast<ThemeService*>([[self window] themeProvider]);
   if (!themeProvider)
     return;
 
   // First draw the toolbar bitmap, so that theme colors can shine through.
   CGFloat backgroundHeight = 2 * [self cr_lineWidth];
   if (NSMinY(dirtyRect) < backgroundHeight) {
     gfx::ScopedNSGraphicsContextSaveGState scopedGState;
     NSGraphicsContext *context = [NSGraphicsContext currentContext];
-    [context cr_setPatternPhase:[[self window] themePatternPhase] forView:self];
+    NSPoint phase = [[self window] themePatternPhaseForAlignment:
+        THEME_PATTERN_ALIGN_WITH_TAB_STRIP];
+    [context cr_setPatternPhase:phase forView:self];
 
     // Themes don't have an inactive image so only look for one if there's no
     // theme.
     bool active = [[self window] isKeyWindow] || [[self window] isMainWindow] ||
                   !themeProvider->UsingDefaultTheme();
     int resource_id = active ? IDR_THEME_TOOLBAR : IDR_THEME_TOOLBAR_INACTIVE;
     [themeProvider->GetNSImageColorNamed(resource_id, true) set];
     NSRectFill(
         NSMakeRect(NSMinX(dirtyRect), 0, NSWidth(dirtyRect), backgroundHeight));
   }
@@ skipping 196 matching lines @@
 
 - (void)setNewTabButton:(NewTabButton*)button {
   newTabButton_.reset([button retain]);
 }
 
 - (void)setController:(TabStripController*)controller {
   controller_ = controller;
 }
 
 @end