Relanding this as the previous iteration broke the chrome os build.

Added a facility in PPAPI to register interface factories which can watch GetInterface calls and
return custom interfaces. Added a basic unit test to validate that the custom factory does get called.

This would eventually be used to register custom interfaces for plugins like NACL which rely on chrome\renderer
provided functionality via the webkit_glue namespace. This will help in eventually building src\content
as a dll.

BUG=82454
TEST=covered by test shell tests.
TBR=apatrick
Review URL: http://codereview.chromium.org/7104015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@87426 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 62 insertions, 0 deletions

diff --git a/webkit/plugins/ppapi/ppapi_interface_factory.cc b/webkit/plugins/ppapi/ppapi_interface_factory.cc
new file mode 100644
index 0000000..587469a
--- /dev/null
+++ b/webkit/plugins/ppapi/ppapi_interface_factory.cc
@@ -0,0 +1,62 @@
+// Copyright (c) 2011 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 "webkit/plugins/ppapi/ppapi_interface_factory.h"
+
+#include <algorithm>
+
+#include "base/logging.h"
+
+namespace webkit {
+namespace ppapi {
+
+base::LazyInstance<PpapiInterfaceFactoryManager>
+    g_ppapi_interface_factory_manager(base::LINKER_INITIALIZED);
+
+PpapiInterfaceFactoryManager::PpapiInterfaceFactoryManager() {
+}
+
+PpapiInterfaceFactoryManager::~PpapiInterfaceFactoryManager() {
+}
+
+void PpapiInterfaceFactoryManager::RegisterFactory(InterfaceFactory* factory) {
+  DCHECK(std::find(interface_factory_list_.begin(),
+                   interface_factory_list_.end(), factory) ==
+         interface_factory_list_.end());
+  interface_factory_list_.push_back(factory);
+}
+
+void PpapiInterfaceFactoryManager::UnregisterFactory(
+    InterfaceFactory* factory) {
+  FactoryList::iterator index =
+      std::find(interface_factory_list_.begin(), interface_factory_list_.end(),
+                factory);
+  DCHECK(index != interface_factory_list_.end());
+  interface_factory_list_.erase(index);
+}
+
+void* PpapiInterfaceFactoryManager::GetInterface(
+    const std::string& interface_name) {
+  FactoryList::iterator index;
+
+  void* ppapi_interface = NULL;
+
+  for (index = interface_factory_list_.begin();
+       index != interface_factory_list_.end();
+       ++index) {
+    ppapi_interface = (*index)(interface_name);
+    if (ppapi_interface)
+      break;
+  }
+  return ppapi_interface;
+}
+
+// static
+PpapiInterfaceFactoryManager* PpapiInterfaceFactoryManager::GetInstance() {
+  return &g_ppapi_interface_factory_manager.Get();
+}
+
+}  // namespace ppapi
+}  // namespace webkit
+