Pepper: Use shared memory for ArrayBufferVar.

This change improves performance for sending ArrayBufferVars between the
plugin and the host. It copies the data from the var into a shared
memory region and sends the shared memory handle over IPC.

This required defining a new message for plugins to request the host to
create shared memory.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11827059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189089 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 22 insertions, 0 deletions

diff --git a/ppapi/proxy/plugin_var_tracker.cc b/ppapi/proxy/plugin_var_tracker.cc
index 384eb3ec..cff8fa1 100644
--- a/ppapi/proxy/plugin_var_tracker.cc
+++ b/ppapi/proxy/plugin_var_tracker.cc
@@ -194,6 +194,12 @@ ArrayBufferVar* PluginVarTracker::CreateArrayBuffer(uint32 size_in_bytes) {
   return new PluginArrayBufferVar(size_in_bytes);
 }
 
+ArrayBufferVar* PluginVarTracker::CreateShmArrayBuffer(
+    uint32 size_in_bytes,
+    base::SharedMemoryHandle handle) {
+  return new PluginArrayBufferVar(size_in_bytes, handle);
+}
+
 void PluginVarTracker::PluginImplementedObjectCreated(
     PP_Instance instance,
     const PP_Var& created_var,
@@ -369,5 +375,21 @@ scoped_refptr<ProxyObjectVar> PluginVarTracker::FindOrMakePluginVarFromHostVar(
   return scoped_refptr<ProxyObjectVar>(ret->second.var->AsProxyObjectVar());
 }
 
+int PluginVarTracker::TrackSharedMemoryHandle(PP_Instance instance,
+                                              base::SharedMemoryHandle handle,
+                                              uint32 size_in_bytes) {
+  NOTREACHED();
+  return -1;
+}
+
+bool PluginVarTracker::StopTrackingSharedMemoryHandle(
+    int id,
+    PP_Instance instance,
+    base::SharedMemoryHandle* handle,
+    uint32* size_in_bytes) {
+  NOTREACHED();
+  return false;
+}
+
 }  // namesace proxy
 }  // namespace ppapi