Pass pepper apps API calls through the existing js apps API bindings.

chrome/renderer/pepper/pepper_extensions_common_host.cc

 // Copyright (c) 2013 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 "chrome/renderer/pepper/pepper_extensions_common_host.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/renderer/extensions/chrome_v8_context.h"
 #include "chrome/renderer/extensions/dispatcher.h"
 #include "chrome/renderer/extensions/extension_helper.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/dispatch_host_message.h"
 #include "ppapi/host/host_message_context.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 
 PepperExtensionsCommonHost::PepperExtensionsCommonHost(
     content::RendererPpapiHost* host,
     PP_Instance instance,
     PP_Resource resource,
-    extensions::Dispatcher* dispatcher)
+    extensions::PepperRequestProxy* pepper_request_proxy)
     : ResourceHost(host->GetPpapiHost(), instance, resource),
       renderer_ppapi_host_(host),
-      dispatcher_(dispatcher) {
-}
+      pepper_request_proxy_(pepper_request_proxy) {}
 
 PepperExtensionsCommonHost::~PepperExtensionsCommonHost() {
-  dispatcher_->request_sender()->InvalidateSource(this);
+  pepper_request_proxy_->InvalidateSource(this);
 }
 
 // static
 PepperExtensionsCommonHost* PepperExtensionsCommonHost::Create(
     content::RendererPpapiHost* host,
     PP_Instance instance,
     PP_Resource resource) {
   content::RenderView* render_view = host->GetRenderViewForInstance(instance);
   if (!render_view)
     return NULL;
   extensions::ExtensionHelper* extension_helper =
       extensions::ExtensionHelper::Get(render_view);
   if (!extension_helper)
     return NULL;
+  blink::WebPluginContainer* container =

[yzshen1, 2013/11/26 19:33:11]

It seems better to move line 54-56 to be right below line 49.

[Sam McNally, 2013/11/27 23:40:26]

Done.

+      host->GetContainerForInstance(instance);
+  if (!container)
+    return NULL;
   extensions::Dispatcher* dispatcher = extension_helper->dispatcher();
   if (!dispatcher)
     return NULL;
+  blink::WebFrame* frame = container->element().document().frame();
+  if (!frame)
+    return NULL;
+  v8::HandleScope scope(v8::Isolate::GetCurrent());
+  extensions::ChromeV8Context* context =
+      dispatcher->v8_context_set().GetByV8Context(
+          frame->mainWorldScriptContext());
+  if (!context)
+    return NULL;
 
-  return new PepperExtensionsCommonHost(host, instance, resource, dispatcher);
+  return new PepperExtensionsCommonHost(
+      host, instance, resource, context->pepper_request_proxy());
 }
 
 int32_t PepperExtensionsCommonHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
   IPC_BEGIN_MESSAGE_MAP(PepperExtensionsCommonHost, msg)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_ExtensionsCommon_Post,
                                       OnPost)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_ExtensionsCommon_Call,
                                       OnCall)
   IPC_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
-extensions::ChromeV8Context* PepperExtensionsCommonHost::GetContext() {
-  blink::WebPluginContainer* container =
-      renderer_ppapi_host_->GetContainerForInstance(pp_instance());
-  if (!container)
-    return NULL;
-
-  blink::WebFrame* frame = container->element().document().frame();
-  v8::HandleScope scope(v8::Isolate::GetCurrent());
-  return dispatcher_->v8_context_set().GetByV8Context(
-      frame->mainWorldScriptContext());
-}
-
 void PepperExtensionsCommonHost::OnResponseReceived(
-    const std::string& /* name */,
     int request_id,
     bool success,
     const base::ListValue& response,
     const std::string& /* error */) {
   PendingRequestMap::iterator iter = pending_request_map_.find(request_id);
 
-  // Ignore responses resulted from calls to OnPost().
-  if (iter == pending_request_map_.end()) {
-    DCHECK_EQ(0u, response.GetSize());
-    return;
-  }
+  DCHECK(iter != pending_request_map_.end());
 
   linked_ptr<ppapi::host::ReplyMessageContext> context = iter->second;
   pending_request_map_.erase(iter);
 
   context->params.set_result(success ? PP_OK : PP_ERROR_FAILED);
   SendReply(*context, PpapiPluginMsg_ExtensionsCommon_CallReply(response));
 }
 
 int32_t PepperExtensionsCommonHost::OnPost(
     ppapi::host::HostMessageContext* context,
     const std::string& request_name,
     base::ListValue& args) {
-  // TODO(yzshen): Add support for calling into JS for APIs that have custom
-  // bindings.
-  int request_id = dispatcher_->request_sender()->GetNextRequestId();
-  dispatcher_->request_sender()->StartRequest(this, request_name, request_id,
-                                              false, false, &args);
+  int request_id;
+  std::string error;
+  bool success = pepper_request_proxy_->StartRequest(

[yzshen1, 2013/11/26 19:33:11]

Please add a TODO (maybe in pepper_request_proxy files) and associate it with a
bug saying that the current approach is not optimal: in most cases we don't do
much in the JS code, and we convert back-and-forth between base::Value args and
v8 objects.

[Sam McNally, 2013/11/27 23:40:26]

Done.

+      this, request_name, false, args, &request_id, &error);
+  if (!success)
+    return PP_ERROR_FAILED;
+
   return PP_OK;
 }
 
 int32_t PepperExtensionsCommonHost::OnCall(
     ppapi::host::HostMessageContext* context,
     const std::string& request_name,
     base::ListValue& args) {
-  // TODO(yzshen): Add support for calling into JS for APIs that have custom
-  // bindings.
-  int request_id = dispatcher_->request_sender()->GetNextRequestId();
+  int request_id;
+  std::string error;
+  bool success = pepper_request_proxy_->StartRequest(
+      this, request_name, true, args, &request_id, &error);
+  if (!success)
+    return PP_ERROR_FAILED;
+
   pending_request_map_[request_id] =
       linked_ptr<ppapi::host::ReplyMessageContext>(
           new ppapi::host::ReplyMessageContext(
               context->MakeReplyMessageContext()));
 
-  dispatcher_->request_sender()->StartRequest(this, request_name, request_id,
-                                              true, false, &args);
   return PP_OK_COMPLETIONPENDING;
 }