Bitmap transport

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
diff --git a/chrome/common/render_messages_internal.h b/chrome/common/render_messages_internal.h
index 02a9a436ea10f8256fec3b746b12320cd28a45cc..f02f5cf06923578ec21285dc3e7409d5d63d2cfa 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -16,6 +16,8 @@
 #include "base/gfx/native_widget_types.h"
 #include "base/shared_memory.h"
 #include "chrome/common/ipc_message_macros.h"
+#include "chrome/common/ipc_maybe.h"
+#include "chrome/common/transport_dib.h"
 #include "skia/include/SkBitmap.h"
 #include "webkit/glue/console_message_level.h"
 #include "webkit/glue/dom_operations.h"
@@ -1168,4 +1170,19 @@ IPC_BEGIN_MESSAGES(ViewHost)
                       double /* left_channel */,
                       double /* right_channel */)
 
+#if defined(OS_MACOSX)
+  // On OSX, we cannot allocated shared memory from within the sandbox, so
+  // this call exists for the renderer to ask the browser to allocate memory
+  // on its behalf. We return a file descriptor to the POSIX shared memory.
+  IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_AllocTransportDIB,
+                              size_t, /* bytes requested */
+                              IPC::Maybe<TransportDIB::Handle> /* DIB */)
+
+  // Since the browser keeps handles to the allocated transport DIBs, this
+  // message is sent to tell the browser that it may release them when the
+  // renderer is finished with them.
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_FreeTransportDIB,
+                       TransportDIB::Id /* DIB id */)
+#endif
+
 IPC_END_MESSAGES(ViewHost)