gpu: Reuse existing code for shared memory allocation.

content/common/child_process_host_impl.cc

Index: content/common/child_process_host_impl.cc
diff --git a/content/common/child_process_host_impl.cc b/content/common/child_process_host_impl.cc
index 42f368d0ed1272b3ac7b67c529fbc6e19ab07e12..529cc77b64b0dc9f1a30bb00c3dfa9911769249a 100644
--- a/content/common/child_process_host_impl.cc
+++ b/content/common/child_process_host_impl.cc
@@ -192,7 +192,7 @@ bool ChildProcessHostImpl::Send(IPC::Message* message) {
 }
 
 void ChildProcessHostImpl::AllocateSharedMemory(
-      size_t buffer_size, base::ProcessHandle child_process_handle,
+      size_t buffer_size,
       base::SharedMemoryHandle* shared_memory_handle) {
   base::SharedMemory shared_buf;
   if (!shared_buf.CreateAnonymous(buffer_size)) {
@@ -200,7 +200,7 @@ void ChildProcessHostImpl::AllocateSharedMemory(
     NOTREACHED() << "Cannot create shared memory buffer";
     return;
   }
-  shared_buf.GiveToProcess(child_process_handle, shared_memory_handle);
+  *shared_memory_handle = shared_buf.TakeHandle();
 }
 
 int ChildProcessHostImpl::GenerateChildProcessUniqueId() {
@@ -316,7 +316,7 @@ void ChildProcessHostImpl::OnBadMessageReceived(const IPC::Message& message) {
 void ChildProcessHostImpl::OnAllocateSharedMemory(
     uint32_t buffer_size,
     base::SharedMemoryHandle* handle) {
-  AllocateSharedMemory(buffer_size, peer_process_.Handle(), handle);
+  AllocateSharedMemory(buffer_size, handle);
 }
 
 void ChildProcessHostImpl::OnShutdownRequest() {
@@ -338,7 +338,7 @@ void ChildProcessHostImpl::OnAllocateGpuMemoryBuffer(
   // sure |usage| is supported here.
   if (gpu::GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage)) {
     *handle = gpu::GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
-        id, gfx::Size(width, height), format, peer_process_.Handle());
+        id, gfx::Size(width, height), format);
   }
 }