Split to SafeBrowsingDatabaseManager into Local* and Remote*.

chrome/browser/safe_browsing/android_safe_browsing_api_handler.cc

+// 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.
+//
+
+#include "chrome/browser/safe_browsing/android_safe_browsing_api_handler.h"
+
+#include <string>
+
+#include "base/android/jni_android.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/safe_browsing/safe_browsing_util.h"
+#include "content/public/browser/browser_thread.h"
+// TODO(nparker): Include JNI-generated file
+
+using content::BrowserThread;
+
+AndroidSafeBrowsingAPIHandler::AndroidSafeBrowsingAPIHandler() {
+  j_context_ = base::android::GetApplicationContext();
+  DCHECK(j_context_);
+
+  // TODO(nparker): Fetch API key pertaining to Chrome.
+  api_key_ = "<todo-get-appropriate-api-key>";
+}
+
+bool AndroidSafeBrowsingAPIHandler::StartURLCheck(
+    const URLCheckCallback& callback,
+    const GURL& url,
+    const std::vector<SBThreatType>& threat_types) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  // Make copy of the callback to add a ref to it.  OnURLCheckDone()
+  // will delete this ptr, thus releasing the internal ref.

[mattm, 2015/05/08 02:17:26]

Stale comment? Also not sure talking about refs here makes sense in any case.
The consumer of a callback shouldn't really care how the callback is
implemented.

Could just say we need to make a copy of the callback on the heap so it can be
passed through JNI.

[Nathan Parker, 2015/05/12 01:04:01]

Done.

+  URLCheckCallback* callback_ptr = new URLCheckCallback(callback);
+  intptr_t callback_id_int = reinterpret_cast<intptr_t>(callback_ptr);
+  jlong callback_id = static_cast<jlong>(callback_id_int);
+
+  // TODO(nparker): Reduce logging before launch of this feature.
+  VLOG(1) << "Starting check " << callback_id << " for URL " << url;
+
+  // TODO(nparker): Implement this.
+  // Convert threat types to API's enums.
+  // Call JNI method.
+
+  // Until we have the Java implementation, just invoke the callback in 500ms
+  // for testing.
+  return BrowserThread::PostDelayedTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&OnURLCheckDone, callback_id, true, jstring()),
+      base::TimeDelta::FromMilliseconds(500));
+}
+
+// Static.

[mattm, 2015/05/08 02:17:26]

nit: In chrome I've only ever seen these comments spelled as "// static"

[Nathan Parker, 2015/05/12 01:04:01]

Done.

+void AndroidSafeBrowsingAPIHandler::OnURLCheckDone(jlong callback_id,
+                                                   jboolean isSuccessful,
+                                                   jstring metadata) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (!callback_id) {
+    DCHECK(false) << "Bad callback_id";
+    return;

[mattm, 2015/05/08 02:17:26]

I don't think you should try to handle this failure, since it should never
occur, right?  Just DCHECK and continue. If somehow there is a time it's null,
we'd rather it crashes so we can get a crash report and know we have a bug.

[Nathan Parker, 2015/05/12 01:04:01]

Interesting.  I may do that in a few other places too then, since I agree
crashing could be more useful than randomly malfunctioning (leaking, hanging)
for very unlikely errors.

Done.

+  }
+  VLOG(1) << "URLCheckDone invoked for check " << callback_id;
+
+  // Convert java long long int to c++ pointer, take ownership.
+  scoped_ptr<URLCheckCallback> callback(
+      reinterpret_cast<URLCheckCallback*>(callback_id));
+
+  // TODO(nparker):
+  // 1) Convert metadata to binary proto of MalwarePatternType so
+  //    SafeBrowsingUIManager::DisplayBlockingPage() can unmarshal it.
+  // 2) Pick the "worst" threat type from metadata and map to SBThreatType.
+
+  callback->Run(SB_THREAT_TYPE_SAFE, std::string());
+  VLOG(1) << "Done with check " << callback_id;
+}