Signal extension API schema corruption to the browser process.

extensions/browser/extension_message_filter.cc

Index: extensions/browser/extension_message_filter.cc
diff --git a/extensions/browser/extension_message_filter.cc b/extensions/browser/extension_message_filter.cc
index 6bdfac024e5f755f20880373371f1b489ddc93e1..dada55122e6e24f0d2c302ace9fed849745a9b65 100644
--- a/extensions/browser/extension_message_filter.cc
+++ b/extensions/browser/extension_message_filter.cc
@@ -18,6 +18,7 @@
 #include "extensions/browser/process_manager_factory.h"
 #include "extensions/browser/process_map.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/extension_api.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "ipc/ipc_message_macros.h"
@@ -134,6 +135,8 @@ bool ExtensionMessageFilter::OnMessageReceived(const IPC::Message& message) {
                         OnExtensionTransferBlobsAck)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_WakeEventPage,
                         OnExtensionWakeEventPage)
+    IPC_MESSAGE_HANDLER(ExtensionHostMsg_NotifyBadExtensionApiSchema,
+                        OnExtensionNotifyBadExtensionApiSchema)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -318,4 +321,9 @@ void ExtensionMessageFilter::SendWakeEventPageResponse(int request_id,
   Send(new ExtensionMsg_WakeEventPageResponse(request_id, success));
 }
 
+void ExtensionMessageFilter::OnExtensionNotifyBadExtensionApiSchema(
+    const std::string& api) {
+  ExtensionAPI::GetSharedInstance()->LoadSchemaListOrDie(api);

[Devlin, 2016/08/19 18:40:57]

Thinking about it, is there a reason to not just do:
const base::DictionaryValue* schema =
ExetnsionAPI::GetSharedInstance()->LoadSchema(api);
CHECK(schema);
KillBadMessageSender();

That way we wouldn't even need LoadSchemaListOrDie().

[Devlin, 2016/08/19 19:13:27]

(Another advantage to that is that then we don't need to worry about collisions
when we rip out unloaded_schemas)

[Wez, 2016/08/20 01:40:39]

Done.

+}
+
 }  // namespace extensions