[Pepper GL] Use shared state to fix a memory leak in MapSub GL extension.

content/renderer/pepper/ppb_graphics_3d_impl.cc

 // Copyright (c) 2012 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/renderer/pepper/ppb_graphics_3d_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 63 matching lines @@
     share_api = enter.object();
   }
   scoped_refptr<PPB_Graphics3D_Impl> graphics_3d(
       new PPB_Graphics3D_Impl(instance));
   if (!graphics_3d->Init(share_api, attrib_list))
     return 0;
   return graphics_3d->GetReference();
 }
 
 // static
-PP_Resource PPB_Graphics3D_Impl::CreateRaw(PP_Instance instance,
-                                           PP_Resource share_context,
-                                           const int32_t* attrib_list) {
+PP_Resource PPB_Graphics3D_Impl::CreateRaw(
+    PP_Instance instance,
+    PP_Resource share_context,
+    const int32_t* attrib_list,
+    base::SharedMemoryHandle* shared_state_handle) {
   PPB_Graphics3D_API* share_api = NULL;
   if (share_context) {
     EnterResourceNoLock<PPB_Graphics3D_API> enter(share_context, true);
     if (enter.failed())
       return 0;
     share_api = enter.object();
   }
   scoped_refptr<PPB_Graphics3D_Impl> graphics_3d(
       new PPB_Graphics3D_Impl(instance));
-  if (!graphics_3d->InitRaw(share_api, attrib_list))
+  if (!graphics_3d->InitRaw(share_api, attrib_list, shared_state_handle))
     return 0;
   return graphics_3d->GetReference();
 }
 
 PP_Bool PPB_Graphics3D_Impl::SetGetBuffer(int32_t transfer_buffer_id) {
   GetCommandBuffer()->SetGetBuffer(transfer_buffer_id);
   return PP_TRUE;
 }
 
 scoped_refptr<gpu::Buffer> PPB_Graphics3D_Impl::CreateTransferBuffer(
@@ skipping 93 matching lines @@
     // Wait for the command to complete on the GPU to allow for throttling.
     command_buffer_->Echo(base::Bind(&PPB_Graphics3D_Impl::OnSwapBuffers,
                                      weak_ptr_factory_.GetWeakPtr()));
   }
 
   return PP_OK_COMPLETIONPENDING;
 }
 
 bool PPB_Graphics3D_Impl::Init(PPB_Graphics3D_API* share_context,
                                const int32_t* attrib_list) {
-  if (!InitRaw(share_context, attrib_list))
+  if (!InitRaw(share_context, attrib_list, NULL))
     return false;
 
   gpu::gles2::GLES2Implementation* share_gles2 = NULL;
   if (share_context) {
     share_gles2 =
         static_cast<PPB_Graphics3D_Shared*>(share_context)->gles2_impl();
   }
 
   return CreateGLES2Impl(kCommandBufferSize, kTransferBufferSize, share_gles2);
 }
 
-bool PPB_Graphics3D_Impl::InitRaw(PPB_Graphics3D_API* share_context,
-                                  const int32_t* attrib_list) {
+bool PPB_Graphics3D_Impl::InitRaw(
+    PPB_Graphics3D_API* share_context,
+    const int32_t* attrib_list,
+    base::SharedMemoryHandle* shared_state_handle) {
   PepperPluginInstanceImpl* plugin_instance =
       HostGlobals::Get()->GetInstance(pp_instance());
   if (!plugin_instance)
     return false;
 
   const WebPreferences& prefs =
       static_cast<RenderViewImpl*>(plugin_instance->GetRenderView())
           ->webkit_preferences();
   // 3D access might be disabled or blacklisted.
   if (!prefs.pepper_3d_enabled)
@@ skipping 48 matching lines @@
         static_cast<PPB_Graphics3D_Impl*>(share_context);
     share_buffer = share_graphics->command_buffer_;
   }
 
   command_buffer_ = channel_->CreateOffscreenCommandBuffer(
       surface_size, share_buffer, attribs, GURL::EmptyGURL(), gpu_preference);
   if (!command_buffer_)
     return false;
   if (!command_buffer_->Initialize())
     return false;
+  if (shared_state_handle)
+    *shared_state_handle = command_buffer_->GetSharedStateHandle();
   mailbox_ = gpu::Mailbox::Generate();
   if (!command_buffer_->ProduceFrontBuffer(mailbox_))
     return false;
   sync_point_ = command_buffer_->InsertSyncPoint();
 
   command_buffer_->SetChannelErrorCallback(base::Bind(
       &PPB_Graphics3D_Impl::OnContextLost, weak_ptr_factory_.GetWeakPtr()));
 
   command_buffer_->SetOnConsoleMessageCallback(base::Bind(
       &PPB_Graphics3D_Impl::OnConsoleMessage, weak_ptr_factory_.GetWeakPtr()));
@@ skipping 58 matching lines @@
       instance->module()->GetPluginInterface(PPP_GRAPHICS_3D_INTERFACE));
   // We have to check *again* that the instance exists, because it could have
   // been deleted during GetPluginInterface(). Even the PluginModule could be
   // deleted, but in that case, the instance should also be gone, so the
   // GetInstance check covers both cases.
   if (ppp_graphics_3d && HostGlobals::Get()->GetInstance(this_pp_instance))
     ppp_graphics_3d->Graphics3DContextLost(this_pp_instance);
 }
 
 }  // namespace content