Add switch to disable recording whole document

content/public/browser/android/synchronous_compositor.h

Index: content/public/browser/android/synchronous_compositor.h
diff --git a/content/public/browser/android/synchronous_compositor.h b/content/public/browser/android/synchronous_compositor.h
index 6aaa2130c6691f814bb264c38642fef9f8b9f0ce..2bec50fa949874465c82d01315904d50ceacc33e 100644
--- a/content/public/browser/android/synchronous_compositor.h
+++ b/content/public/browser/android/synchronous_compositor.h
@@ -63,6 +63,11 @@ class CONTENT_EXPORT SynchronousCompositor {
   static void SetGpuService(
       scoped_refptr<gpu::InProcessCommandBuffer::Service> service);
 
+  // By default, synchronous compopsitor records the full layer, not only
+  // what is inside and around the view port. Call this on start up to revert
+  // to default behavior when synchronous compositor is not used.
+  static void DisableRecordFullLayer();
+
   // Synchronously initialize compositor for hardware draw. Can only be called
   // while compositor is in software only mode, either after compositor is
   // first created or after ReleaseHwDraw is called. It is invalid to