Implement the skeleton of an android content shell.

content/browser/android/library_loader_hooks.cc

+// Copyright (c) 2010 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 "content/browser/android/library_loader_hooks.h"
+
+#include "base/android/build_info.h"
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/android/path_utils.h"
+#include "base/command_line.h"
+#include "base/debug/trace_event.h"
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/string_tokenizer.h"
+#include "base/string_util.h"
+#include "base/tracked_objects.h"
+#include "content/browser/android/jni_helper.h"
+#include "content/public/common/content_switches.h"
+#include "media/base/android/media_player_bridge.h"
+
+namespace base {
+bool RegisterSystemMessageHandler(JNIEnv* env);
+}
+
+// The following arrays list the registration methods for all native methods
+// required by either ChromeView or tests. They are registered in all
+// processes. Native methods required only by the browser application in the
+// browser process should be registered in InitBrowserProcess().
+
+static RegistrationMethod kContentRegisteredMethods[] = {
+  { "MediaPlayerListener",
+    media::MediaPlayerBridge::RegisterMediaPlayerListener },
+};
+
+static RegistrationMethod kBaseRegisteredMethods[] = {
+  { "BuildInfo", base::android::RegisterBuildInfo },
+  { "PathUtils", base::android::RegisterPathUtils },
+  { "SystemMessageHandler", base::RegisterSystemMessageHandler },
+};
+
+// Return true if the registration of the given methods succeed.
+bool RegisterNativeMethods(JNIEnv* env,
+                           const RegistrationMethod* method,
+                           size_t count) {
+  const RegistrationMethod* end = method + count;
+  while (method != end) {
+    if (!method->func(env) < 0) {
+      DLOG(ERROR) << method->name << " failed registration!";
+      return false;
+    }
+    method++;
+  }
+  return true;
+}
+
+jboolean LibraryLoaderEntryHook(JNIEnv* env, jclass clazz,
+                                jobjectArray init_command_line) {
+
+  // TODO(tedchoc): Initialize the native command line from the java array
+  // passed in.
+
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+
+  if (command_line->HasSwitch(switches::kTraceStartup)) {
+    base::debug::TraceLog::GetInstance()->SetEnabled(
+        command_line->GetSwitchValueASCII(switches::kTraceStartup));
+  }
+
+  // Can only use event tracing after setting up the command line.
+  TRACE_EVENT0("jni", "JNI_OnLoad continuation");
+
+  logging::InitLogging(NULL,
+                       logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG,
+                       logging::DONT_LOCK_LOG_FILE,
+                       logging::DELETE_OLD_LOG_FILE,
+                       logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS);
+  // To view log output with IDs and timestamps use "adb logcat -v threadtime".
+  logging::SetLogItems(false,    // Process ID
+                       false,    // Thread ID
+                       false,    // Timestamp
+                       false);   // Tick count
+  VLOG(0) << "Chromium logging enabled: level = " << logging::GetMinLogLevel()
+          << ", default verbosity = " << logging::GetVlogVerbosity();
+
+  if (!RegisterNativeMethods(env, kBaseRegisteredMethods,
+                             arraysize(kBaseRegisteredMethods)))
+    return JNI_FALSE;
+
+  // TODO(yfriedman): Add net registration.
+
+  if (!RegisterNativeMethods(env, kContentRegisteredMethods,
+                             arraysize(kContentRegisteredMethods)))
+    return JNI_FALSE;
+
+  return JNI_TRUE;
+}
+
+bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
+  // TODO(bulach): use the jni generator once we move jni_helper methods here.
+  const JNINativeMethod kMethods[] = {
+      { "nativeLibraryLoadedOnMainThread", "([Ljava/lang/String;)Z",
+          reinterpret_cast<void*>(LibraryLoaderEntryHook) },
+  };
+  const int kMethodsSize = arraysize(kMethods);
+  // TODO(tedchoc): Upstream LibraryLoader.java and replace path to make this
+  // work.
+  const char kLibraryLoaderPath[] = "";
+  base::android::ScopedJavaLocalRef<jclass> clazz =
+      base::android::GetClass(env, kLibraryLoaderPath);
+
+  if (env->RegisterNatives(clazz.obj(),
+                           kMethods,
+                           kMethodsSize) < 0) {
+    return false;
+  }
+  return true;
+}