[Explore Sites]: Add stub JNI bridge for explore sites.

This will later be used to fetch resources for the UI.

Bug: 852075
Change-Id: I58fa78a458c9cd329d55d7b4042c15b7f721aa97
Reviewed-on: https://chromium-review.googlesource.com/1095691Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Cathy Li <chili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566744}

chrome/android/java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesBridge.java

+// Copyright 2018 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.
+
+package org.chromium.chrome.browser.explore_sites;
+
+import android.graphics.Bitmap;
+
+import org.chromium.base.Callback;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.chrome.browser.profiles.Profile;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The model and controller for a group of explore options.
+ */
+@JNINamespace("explore_sites")
+public class ExploreSitesBridge {
+    private static final String TAG = "ExploreSitesBridge";
+
+    private long mNativeExploreSitesBridge;
+
+    /**
+     * Creates an explore sites bridge for a given profile.
+     */
+    public ExploreSitesBridge(Profile profile) {
+        mNativeExploreSitesBridge = nativeInit(profile);
+    }
+
+    /**
+     * Fetches a JSON string from URL, returning the parsed JSONobject in a callback.
+     */
+    public void getNtpCategories(
+            final String url, final Callback<List<ExploreSitesCategoryTile>> callback) {
+        List<ExploreSitesCategoryTile> result = new ArrayList<>();
+        nativeGetNtpCategories(mNativeExploreSitesBridge, url, result, callback);
+    }
+
+    /**
+     * Fetches an icon from a url and returns in a Bitmap image.
+     */
+    public void getIcon(final String iconUrl, final Callback<Bitmap> callback) {}
+
+    /**
+     * Destroys the native object. Call only when no longer needed.
+     */
+    public void destroy() {
+        nativeDestroy(mNativeExploreSitesBridge);
+    }
+
+    private native long nativeInit(Profile profile);
+    private native void nativeGetNtpCategories(long nativeExploreSitesBridge, String url,
+            List<ExploreSitesCategoryTile> result,
+            Callback<List<ExploreSitesCategoryTile>> callback);
+    private native void nativeDestroy(long nativeExploreSitesBridge);
+}

chrome/android/java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesCategoryTile.java

+// Copyright 2018 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.
+
+package org.chromium.chrome.browser.explore_sites;
+
+import android.graphics.drawable.Drawable;
+
+/**
+ * Class encapsulating data needed to render a category tile for explore sites section
+ * on the NTP.
+ */
+public class ExploreSitesCategoryTile {
+    private String mNavigationUrl;
+    private String mIconUrl;
+    private String mCategoryName;
+    private Drawable mIconDrawable;
+
+    public ExploreSitesCategoryTile() {
+        mNavigationUrl = "";
+        mIconUrl = "";
+        mCategoryName = "";
+    }
+
+    public ExploreSitesCategoryTile(String categoryName, String iconUrl, String navigationUrl) {
+        mCategoryName = categoryName;
+        mIconUrl = iconUrl;
+        mNavigationUrl = navigationUrl;
+    }
+
+    public String getNavigationUrl() {
+        return mNavigationUrl;
+    }
+
+    public String getIconUrl() {
+        return mIconUrl;
+    }
+
+    public String getCategoryName() {
+        return mCategoryName;
+    }
+
+    public void setIconDrawable(Drawable iconDrawable) {
+        mIconDrawable = iconDrawable;
+    }
+
+    public Drawable getIconDrawable() {
+        return mIconDrawable;
+    }
+}

chrome/android/java_sources.gni

@@ -490,6 +490,8 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/download/ui/SpaceDisplay.java",
   "java/src/org/chromium/chrome/browser/download/ui/StorageSummary.java",
   "java/src/org/chromium/chrome/browser/engagement/SiteEngagementService.java",
+  "java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesBridge.java",
+  "java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesCategoryTile.java",
   "java/src/org/chromium/chrome/browser/externalauth/ExternalAuthUtils.java",
   "java/src/org/chromium/chrome/browser/externalauth/UserRecoverableErrorHandler.java",
   "java/src/org/chromium/chrome/browser/externalauth/VerifiedHandler.java",

chrome/browser/BUILD.gn

@@ -2058,6 +2058,8 @@ jumbo_split_static_library("browser") {
       "android/download/service/download_background_task.cc",
       "android/download/service/download_task_scheduler.cc",
       "android/download/service/download_task_scheduler.h",
+      "android/explore_sites/explore_sites_bridge.cc",
+      "android/explore_sites/explore_sites_bridge.h",
       "android/favicon_helper.cc",
       "android/favicon_helper.h",
       "android/feature_engagement/tracker_factory_android.cc",
@@ -4361,6 +4363,7 @@ if (is_android) {
       "../android/java/src/org/chromium/chrome/browser/download/service/DownloadBackgroundTask.java",
       "../android/java/src/org/chromium/chrome/browser/download/service/DownloadTaskScheduler.java",
       "../android/java/src/org/chromium/chrome/browser/engagement/SiteEngagementService.java",
+      "../android/java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesBridge.java",
       "../android/java/src/org/chromium/chrome/browser/favicon/FaviconHelper.java",
       "../android/java/src/org/chromium/chrome/browser/favicon/LargeIconBridge.java",
       "../android/java/src/org/chromium/chrome/browser/feature_engagement/TrackerFactory.java",

chrome/browser/android/explore_sites/OWNERS

+chili@chromium.org
+dewittj@chromium.org
+dimich@chromium.org
+freedjm@chromium.org
+
+# TEAM: offline-dev@chromium.org

chrome/browser/android/explore_sites/explore_sites_bridge.cc

+// Copyright 2018 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/explore_sites/explore_sites_bridge.h"
+
+#include "base/android/callback_android.h"
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/bind.h"
+#include "jni/ExploreSitesBridge_jni.h"
+#include "services/network/public/cpp/simple_url_loader.h"
+
+namespace explore_sites {
+
+static jlong JNI_ExploreSitesBridge_Init(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj,
+    const base::android::JavaParamRef<jobject>& j_profile) {
+  ExploreSitesBridge* explore_sites_bridge = new ExploreSitesBridge(j_profile);
+  return reinterpret_cast<intptr_t>(explore_sites_bridge);
+}
+
+ExploreSitesBridge::ExploreSitesBridge(
+    const base::android::JavaRef<jobject>& j_profile)
+    : weak_ptr_factory_(this) {}
+
+void ExploreSitesBridge::Destroy(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj) {
+  delete this;
+}
+
+void ExploreSitesBridge::GetNtpCategories(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj,
+    const base::android::JavaParamRef<jstring>& url,
+    const base::android::JavaParamRef<jobject>& j_result_obj,
+    const base::android::JavaParamRef<jobject>& j_callback_obj) {}
+
+ExploreSitesBridge::~ExploreSitesBridge() {}
+
+}  // namespace explore_sites

chrome/browser/android/explore_sites/explore_sites_bridge.h

+// Copyright 2018 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.
+
+#ifndef CHROME_BROWSER_ANDROID_EXPLORE_SITES_EXPLORE_SITES_BRIDGE_H_
+#define CHROME_BROWSER_ANDROID_EXPLORE_SITES_EXPLORE_SITES_BRIDGE_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+
+namespace explore_sites {
+
+/**
+ * Bridge between C++ and Java for fetching and decoding URLs and images.
+ */
+class ExploreSitesBridge {
+ public:
+  explicit ExploreSitesBridge(const base::android::JavaRef<jobject>& j_profile);
+  void Destroy(JNIEnv*, const base::android::JavaParamRef<jobject>& obj);
+
+  void GetNtpCategories(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jstring>& url,
+      const base::android::JavaParamRef<jobject>& j_result_obj,
+      const base::android::JavaParamRef<jobject>& j_callback_obj);
+
+ private:
+  virtual ~ExploreSitesBridge();
+
+  base::WeakPtrFactory<ExploreSitesBridge> weak_ptr_factory_;
+  DISALLOW_COPY_AND_ASSIGN(ExploreSitesBridge);
+};
+
+}  // namespace explore_sites
+
+#endif  // CHROME_BROWSER_ANDROID_EXPLORE_SITES_EXPLORE_SITES_BRIDGE_H_