predictors: Make the resource_prefetch_predictor accessible from Java.

chrome/browser/predictors/resource_prefetch_predictor_android.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/predictors/resource_prefetch_predictor_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_android.h"
+#include "jni/ResourcePrefetchPredictor_jni.h"
+
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
+
+namespace predictors {
+
+void ResourcePrefetchPredictorAndroid::StartPrefetching(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller,
+    const JavaParamRef<jstring>& j_url) {
+  if (!predictor_)
+    return;
+  GURL url = GURL(base::android::ConvertJavaStringToUTF16(env, j_url));
+  predictor_->StartPrefetching(url);
+}
+
+void ResourcePrefetchPredictorAndroid::StopPrefetching(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jcaller,
+    const JavaParamRef<jstring>& j_url) {
+  if (!predictor_)
+    return;
+  GURL url = GURL(base::android::ConvertJavaStringToUTF16(env, j_url));
+  predictor_->StopPrefetching(url);
+}
+
+// static
+jlong ResourcePrefetchPredictorAndroid::GetForProfile(JNIEnv* env,
+                                                      jclass clazz,
+                                                      jobject j_profile) {
+  Profile* profile = ProfileAndroid::FromProfileAndroid(j_profile);
+  ResourcePrefetchPredictor* predictor =
+      ResourcePrefetchPredictorFactory::GetInstance()->GetForProfile(profile);
+  ResourcePrefetchPredictorAndroid* predictor_android =
+      new ResourcePrefetchPredictorAndroid(predictor);
+  return static_cast<jlong>(reinterpret_cast<intptr_t>(predictor_android));
+}
+
+// static
+bool ResourcePrefetchPredictorAndroid::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+static jlong GetResourcePrefetchPredictorForProfile(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    const JavaParamRef<jobject>& j_profile) {
+  return ResourcePrefetchPredictorAndroid::GetForProfile(env, clazz.obj(),
+                                                         j_profile.obj());
+}
+
+ResourcePrefetchPredictorAndroid::ResourcePrefetchPredictorAndroid(
+    ResourcePrefetchPredictor* predictor)
+    : predictor_(predictor) {}
+
+}  // namespace predictors