Add GpuMemoryBuffer CreateFromClientId interface

blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc

Index: blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc
diff --git a/blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc b/blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc
index f1c05796992c98d7a163479de7d8bbf1540331da..5491c9de8db4b6c13e3b37532b14f56292ae6a04 100644
--- a/blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc
+++ b/blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.cc
@@ -133,6 +133,14 @@ BlimpGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
       handle.offset, handle.stride));
 }
 
+std::unique_ptr<gfx::GpuMemoryBuffer>
+BlimpGpuMemoryBufferManager::CreateGpuMemoryBufferFromChildId(
+    int child_client_id,
+    const gfx::GpuMemoryBufferId& gpu_memory_buffer_id) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
 gfx::GpuMemoryBuffer*
 BlimpGpuMemoryBufferManager::GpuMemoryBufferFromClientBuffer(
     ClientBuffer buffer) {