Enable pinch-zoom on the new login page.

extensions/browser/api/web_view/web_view_internal_api.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_BROWSER_API_WEB_VIEW_WEB_VIEW_INTERNAL_API_H_
 #define EXTENSIONS_BROWSER_API_WEB_VIEW_WEB_VIEW_INTERNAL_API_H_
 
 #include "extensions/browser/api/capture_web_contents_function.h"
 #include "extensions/browser/api/execute_code_function.h"
 #include "extensions/browser/extension_function.h"
@@ skipping 130 matching lines @@
 
  protected:
   ~WebViewInternalSetAllowTransparencyFunction() override;
 
  private:
   bool RunAsyncSafe(WebViewGuest* guest) override;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewInternalSetAllowTransparencyFunction);
 };
 
+class WebViewInternalSetAllowScalingFunction
+    : public WebViewInternalExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("webViewInternal.setAllowScaling",
+                             WEBVIEWINTERNAL_SETALLOWSCALING);
+
+  WebViewInternalSetAllowScalingFunction();
+
+ protected:
+  ~WebViewInternalSetAllowScalingFunction() override;
+
+ private:
+  bool RunAsyncSafe(WebViewGuest* guest) override;
+
+  DISALLOW_COPY_AND_ASSIGN(WebViewInternalSetAllowScalingFunction);
+};
+
 class WebViewInternalSetZoomFunction : public WebViewInternalExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("webViewInternal.setZoom",
                              WEBVIEWINTERNAL_SETZOOM);
 
   WebViewInternalSetZoomFunction();
 
  protected:
   ~WebViewInternalSetZoomFunction() override;
 
@@ skipping 199 matching lines @@
   uint32 remove_mask_;
   // Tracks any data related or parse errors.
   bool bad_message_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewInternalClearDataFunction);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_VIEW_WEB_VIEW_INTERNAL_API_H_