discardable_memory: Using mojo IPC to replace Chrome IPC

content/ppapi_plugin/ppapi_thread.h

Index: content/ppapi_plugin/ppapi_thread.h
diff --git a/content/ppapi_plugin/ppapi_thread.h b/content/ppapi_plugin/ppapi_thread.h
index a3b322bb7aa6a07bca4082174d29f60f9aeb30f4..f3425cbeaa896538f79929f56a2ac2fd9b7c2192 100644
--- a/content/ppapi_plugin/ppapi_thread.h
+++ b/content/ppapi_plugin/ppapi_thread.h
@@ -34,6 +34,10 @@ class CommandLine;
 class FilePath;
 }
 
+namespace discardable_memory {
+class ClientDiscardableSharedMemoryManager;
+}
+
 namespace IPC {
 struct ChannelHandle;
 }
@@ -172,6 +176,9 @@ class PpapiThread : public ChildThreadImpl,
   base::win::ScopedHandle peer_handle_;
 #endif
 
+  std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>
+      discardable_shared_memory_manager_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(PpapiThread);
 };