[Extensions Binding] Allow for registering custom hooks

extensions/renderer/api_binding_hooks.cc

+// Copyright 2016 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 "extensions/renderer/api_binding_hooks.h"
+
+namespace extensions {
+
+APIBindingHooks::APIBindingHooks(const std::string& api_name)
+    : api_name_(api_name) {}
+APIBindingHooks::~APIBindingHooks() {}
+
+void APIBindingHooks::RegisterHandleRequest(const std::string& method_name,
+                                            const HandleRequestHook& hook) {
+  request_hooks_[method_name] = hook;
+}
+
+APIBindingHooks::HandleRequestHook APIBindingHooks::GetHandleRequest(
+    const std::string& method_name) {
+  auto global_iter = request_hooks_.find(method_name);

[jbroman, 2016/12/08 16:58:56]

What's global about this iterator?

[Devlin, 2016/12/08 19:12:02]

Named from when there was a per-context iter in the JS impl.  Renamed.

+  if (global_iter != request_hooks_.end())
+    return global_iter->second;
+
+  return HandleRequestHook();
+}
+
+}  // namespace extensions