Disable zoom bubble for PDF extension.

chrome/browser/extensions/extension_util.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_util.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/values.h"
@@ skipping 180 matching lines @@
                         content::BrowserContext* context) {
   CHECK(extension);
   if (extension->is_hosted_app())
     return true;
   // Packaged apps and regular extensions need to be enabled specifically for
   // incognito (and split mode should be set).
   return IncognitoInfo::IsSplitMode(extension) &&
          IsIncognitoEnabled(extension->id(), context);
 }
 
+bool ZoomWithoutBubble(const Extension* extension) {

[Ken Rockot(use gerrit already), 2015/10/21 16:53:30]

nit: How about "CanZoomWithoutBubble" or "AllowZoomWithoutBubble"? i.e.
something to convey that it's a test for permission rather than an imperative
command

[wjmaclean, 2015/10/21 16:59:46]

Done.

I like "AllowZoomWithoutBubble()" ... let's go with that!

+  return FeatureProvider::GetBehaviorFeature(
+             BehaviorFeature::kZoomWithoutBubble)
+      ->IsAvailableToExtension(extension)
+      .is_available();
+}
+
 bool AllowFileAccess(const std::string& extension_id,
                      content::BrowserContext* context) {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
              switches::kDisableExtensionsFileAccessCheck) ||
          ExtensionPrefs::Get(context)->AllowFileAccess(extension_id);
 }
 
 void SetAllowFileAccess(const std::string& extension_id,
                         content::BrowserContext* context,
                         bool allow) {
@@ skipping 165 matching lines @@
 }
 
 bool NeedCustodianApprovalForPermissionIncrease() {
   const std::string group_name = base::FieldTrialList::FindFullName(
       kSupervisedUserExtensionPermissionIncreaseFieldTrialName);
   return group_name == "NeedCustodianApproval";
 }
 
 }  // namespace util
 }  // namespace extensions