Add static method WebApkIconHasher::DownloadAndComputeMurmur2Hash

chrome/browser/android/webapk/webapk_icon_hasher.cc

 // Copyright 2016 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/webapk/webapk_icon_hasher.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "net/base/data_url.h"
@@ skipping 26 matching lines @@
 WebApkIconHasher::WebApkIconHasher(
     net::URLRequestContextGetter* url_request_context_getter,
     const GURL& icon_url,
     const Murmur2HashCallback& callback)
     : url_request_context_getter_(url_request_context_getter),
       icon_url_(icon_url),
       callback_(callback) {}
 
 WebApkIconHasher::~WebApkIconHasher() {}
 
+// static
+void WebApkIconHasher::DownloadAndComputeMurmur2Hash(
+    net::URLRequestContextGetter* request_context_getter,
+    const GURL& icon_url,
+    const Murmur2HashCallback& callback) {
+  // The icon hasher will delete itself when it is done.
+  WebApkIconHasher* webapk_icon_hasher =
+      new WebApkIconHasher(request_context_getter, icon_url, callback);
+  webapk_icon_hasher->DownloadAndComputeMurmur2Hash();
+}
+
 void WebApkIconHasher::DownloadAndComputeMurmur2Hash() {
   if (!icon_url_.is_valid()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   base::Bind(callback_, ""));
     return;
   }
 
   if (icon_url_.SchemeIs(url::kDataScheme)) {
     std::string mime_type, char_set, data;
     std::string hash;
@@ skipping 16 matching lines @@
   url_fetcher_->SetRequestContext(url_request_context_getter_);
   url_fetcher_->Start();
 }
 
 void WebApkIconHasher::OnURLFetchComplete(const net::URLFetcher* source) {
   download_timeout_timer_.Stop();
 
   if (!source->GetStatus().is_success() ||
       source->GetResponseCode() != net::HTTP_OK) {
     callback_.Run("");
+    delete this;
     return;
   }
 
   // WARNING: We are running in the browser process. |raw_image_data| is the
   // image's raw, unsanitized bytes from the web. |raw_image_data| may contain
   // malicious data. Decoding unsanitized bitmap data to an SkBitmap in the
   // browser process is a security bug.
   std::string raw_image_data;
   source->GetResponseAsString(&raw_image_data);
   callback_.Run(ComputeMurmur2Hash(raw_image_data));
+  delete this;
 }
 
 void WebApkIconHasher::OnDownloadTimedOut() {
   url_fetcher_.reset();
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(callback_, ""));
+  delete this;
 }