Change default force composite setting to true

Source/core/testing/DummyPageHolder.cpp

Index: Source/core/testing/DummyPageHolder.cpp
diff --git a/Source/core/testing/DummyPageHolder.cpp b/Source/core/testing/DummyPageHolder.cpp
index 61b2f77cc869311e401d4f80d94f970b338dc355..1014a150bf11689172a851bce476bbbaf788e0e9 100644
--- a/Source/core/testing/DummyPageHolder.cpp
+++ b/Source/core/testing/DummyPageHolder.cpp
@@ -34,6 +34,7 @@
 #include "core/frame/DOMWindow.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "wtf/Assertions.h"
 
 namespace WebCore {
@@ -53,6 +54,10 @@ DummyPageHolder::DummyPageHolder(const IntSize& initialViewSize)
     m_pageClients.backForwardClient = &m_backForwardClient;
 
     m_page = adoptPtrWillBeNoop(new Page(m_pageClients));
+    Settings& settings = m_page->settings();
+    // FIXME: http://crbug.com/363843. This needs to find a better way to
+    // not create graphics layers.
+    settings.setAcceleratedCompositingEnabled(false);
 
     m_frame = LocalFrame::create(&m_frameLoaderClient, &m_page->frameHost(), 0);
     m_frame->setView(FrameView::create(m_frame.get(), initialViewSize));