Adds initial JNI bridge code for Background Scheduler implementation.

chrome/browser/android/offline_pages/background_scheduler_bridge.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 "base/android/scoped_java_ref.h"
+#include "chrome/browser/android/offline_pages/background_scheduler_bridge.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_android.h"
+#include "jni/BackgroundSchedulerBridge_jni.h"
+
+using base::android::ScopedJavaGlobalRef;
+
+namespace offline_pages {
+namespace android {
+
+namespace {
+
+// C++ callback that delegates to Java callback.
+void ProcessingDoneCallback(
+    const ScopedJavaGlobalRef<jobject>& j_callback_obj) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_ProcessingDoneCallback_onResult(env, j_callback_obj.obj());
+}
+
+}  // namespace
+
+// JNI call to start request processing.
+static jboolean StartProcessing(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& jcaller,
+    const JavaParamRef<jobject>& j_profile,
+    const JavaParamRef<jobject>& j_callback_obj) {
+  ScopedJavaGlobalRef<jobject> j_callback_ref;
+  j_callback_ref.Reset(env, j_callback_obj);
+  base::Bind(&ProcessingDoneCallback, j_callback_ref);
+  // TODO(dougarnett): lookup/create RequestCoordinator KeyedService
+  // and call StartProcessing on it with Bind-ed j_callback_obj.

[fgorski, 2016/04/28 11:44:00]

nit: bound?

+  return false;
+}
+
+BackgroundSchedulerBridge::BackgroundSchedulerBridge() {
+}
+
+BackgroundSchedulerBridge::~BackgroundSchedulerBridge() {
+}
+
+void BackgroundSchedulerBridge::EnsureScheduled(
+    const TriggerCondition& trigger_condition) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  // TODO(dougarnett): pass trigger_condition.
+  Java_BackgroundSchedulerBridge_ensureScheduled(env);
+}
+
+void BackgroundSchedulerBridge::ClearScheduled() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_BackgroundSchedulerBridge_clearScheduled(env);
+}
+
+bool RegisterBackgroundSchedulerBridge(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace android
+}  // namespace offline_pages