Move the android library loader from content to base

base/android/library_loader/library_loader_hooks.cc

+// Copyright (c) 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 "base/android/library_loader/library_loader_hooks.h"
+
+#include "base/at_exit.h"
+#include "base/metrics/histogram.h"
+#include "jni/LibraryLoader_jni.h"
+
+namespace base {
+namespace android {
+
+namespace {
+
+base::AtExitManager* g_at_exit_manager = NULL;
+const char* g_library_version_number = "";
+LibraryLoadedHook* g_registration_callback = NULL;
+
+} // namespace
+
+void SetLibraryLoadedHook(LibraryLoadedHook* func) {
+  g_registration_callback = func;
+}
+
+static jboolean LibraryLoaded(JNIEnv* env, jclass clazz,
+                          jobjectArray init_command_line) {
+  if(g_registration_callback == NULL) {
+    return true;
+  }
+  return g_registration_callback(env, clazz, init_command_line);
+}
+
+static void RecordChromiumAndroidLinkerHistogram(
+    JNIEnv* env,
+    jclass clazz,
+    jboolean loaded_at_fixed_address_failed,
+    jboolean is_low_memory_device) {
+  UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.LoadedAtFixedAddressFailed",
+                        loaded_at_fixed_address_failed);
+  UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.IsLowMemoryDevice",
+                        is_low_memory_device);
+}
+
+void LibraryLoaderExitHook() {
+  if (g_at_exit_manager) {
+    delete g_at_exit_manager;
+    g_at_exit_manager = NULL;
+  }
+}
+
+bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
+  // We need the AtExitManager to be created at the very beginning.
+  g_at_exit_manager = new base::AtExitManager();
+
+  return RegisterNativesImpl(env);
+}
+
+void SetVersionNumber(const char* version_number) {
+  g_library_version_number = strdup(version_number);
+}
+
+jstring GetVersionNumber(JNIEnv* env, jclass clazz) {
+  return env->NewStringUTF(g_library_version_number);
+}
+
+}  // namespace android
+}  // namespace base