Bug 912657 - Add support for APZC in the B2G parent process (without turning it on everywhere). r=ajones

widget/gonk/ParentProcessController.cpp

@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ParentProcessController.h"
+#include "nsIContent.h"
+#include "nsLayoutUtils.h"
+#include "APZCCallbackHelper.h"
+#include "base/message_loop.h"
+
+namespace mozilla {
+namespace widget {
+
+class RequestContentRepaintEvent : public nsRunnable
+{
+    typedef mozilla::layers::FrameMetrics FrameMetrics;
+
+public:
+    RequestContentRepaintEvent(const FrameMetrics& aFrameMetrics)
+        : mFrameMetrics(aFrameMetrics)
+    {
+    }
+
+    NS_IMETHOD Run() {
+        MOZ_ASSERT(NS_IsMainThread());
+        nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(mFrameMetrics.mScrollId);
+        if (content) {
+            APZCCallbackHelper::UpdateSubFrame(content, mFrameMetrics);
+        }
+        return NS_OK;
+    }
+
+protected:
+    const FrameMetrics mFrameMetrics;
+};
+
+void
+ParentProcessController::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
+{
+    if (aFrameMetrics.mScrollId == FrameMetrics::NULL_SCROLL_ID) {
+        return;
+    }
+
+    nsCOMPtr<nsIRunnable> r = new RequestContentRepaintEvent(aFrameMetrics);
+    if (!NS_IsMainThread()) {
+        NS_DispatchToMainThread(r);
+    } else {
+        r->Run();
+    }
+}
+
+void
+ParentProcessController::PostDelayedTask(Task* aTask, int aDelayMs)
+{
+    MessageLoop::current()->PostDelayedTask(FROM_HERE, aTask, aDelayMs);
+}
+
+}
+}