Index: content/common/frame_messages.h |
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h |
index 023494a36d6e168d991f4129d7d32df12797a85b..0442702b4436d2608fba0d2c67efd19ed4c53bcb 100644 |
--- a/content/common/frame_messages.h |
+++ b/content/common/frame_messages.h |
@@ -301,6 +301,11 @@ IPC_STRUCT_BEGIN_WITH_PARENT(FrameHostMsg_DidCommitProvisionalLoad_Params, |
// in BeginNavigationParams. |
IPC_STRUCT_MEMBER(GURL, searchable_form_url) |
IPC_STRUCT_MEMBER(std::string, searchable_form_encoding) |
+ |
+ // This is a non-decreasing value that the browser process can use to |
+ // identify and discard compositor frames that correspond to now-unloaded |
+ // web content. |
+ IPC_STRUCT_MEMBER(uint32_t, content_source_id) |
IPC_STRUCT_END() |
IPC_STRUCT_BEGIN(FrameMsg_PostMessage_Params) |