Update offline pages UMAs

chrome/browser/android/offline_pages/offline_page_bridge.cc

 // Copyright 2015 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/android/offline_pages/offline_page_bridge.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/android/jni_array.h"
@@ skipping 285 matching lines @@
     const JavaParamRef<jobject>& j_callback_obj,
     const JavaParamRef<jobject>& j_web_contents,
     const JavaParamRef<jstring>& j_namespace,
     const JavaParamRef<jstring>& j_client_id) {
   DCHECK(j_callback_obj);
   DCHECK(j_web_contents);
 
   ScopedJavaGlobalRef<jobject> j_callback_ref;
   j_callback_ref.Reset(env, j_callback_obj);
 
+  GURL url;
+  std::unique_ptr<OfflinePageArchiver> archiver;
+
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(j_web_contents);
-  GURL url(web_contents->GetLastCommittedURL());
-
-  std::unique_ptr<OfflinePageArchiver> archiver(
-      new OfflinePageMHTMLArchiver(web_contents));
+  if (web_contents) {
+    url = web_contents->GetLastCommittedURL();
+    archiver.reset(new OfflinePageMHTMLArchiver(web_contents));
+  }
 
   offline_pages::ClientId client_id;
   client_id.name_space = ConvertJavaStringToUTF8(env, j_namespace);
   client_id.id = ConvertJavaStringToUTF8(env, j_client_id);
 
   offline_page_model_->SavePage(
       url, client_id, std::move(archiver),
       base::Bind(&SavePageCallback, j_callback_ref, url));
 }
 
@@ skipping 77 matching lines @@
       ConvertUTF8ToJavaString(env, client_id.name_space).obj(),
       ConvertUTF8ToJavaString(env, client_id.id).obj());
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages