Add UI hook for distilling web pages for test shell (relanding)

components/dom_distiller/core/url_utils_android.cc

+// Copyright 2014 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 "components/dom_distiller/core/url_utils_android.h"
+
+#include <string>
+
+#include "base/android/jni_string.h"
+#include "components/dom_distiller/core/url_utils.h"
+#include "jni/DomDistillerUrlUtils_jni.h"
+#include "url/gurl.h"
+
+namespace dom_distiller {
+
+namespace url_utils {
+
+namespace android {
+
+jstring GetDistillerViewUrlFromUrl(JNIEnv* env,
+                                   jclass clazz,
+                                   jstring j_scheme,
+                                   jstring j_url) {
+  std::string scheme(base::android::ConvertJavaStringToUTF8(env, j_scheme));
+  GURL url(base::android::ConvertJavaStringToUTF8(env, j_url));
+  if (!url.is_valid()) {
+    return NULL;
+  }
+  GURL view_url =
+      dom_distiller::url_utils::GetDistillerViewUrlFromUrl(scheme, url);
+  if (!view_url.is_valid()) {
+    return NULL;
+  }
+  return base::android::ConvertUTF8ToJavaString(env, view_url.spec()).Release();
+}
+
+bool RegisterUrlUtils(JNIEnv* env) { return RegisterNativesImpl(env); }
+
+}  // namespace android
+
+}  // namespace url_utils
+
+}  // namespace dom_distiller