Bug 1283302: Sets the default value for nglayout.initialpaint.delay to 5ms on desktop (stays 250 ms on Android) per user research conclusions. r=tn

MozReview-Commit-ID: LWfmMoBcbnL

layout/base/nsPresShell.h

@@ -67,9 +67,13 @@ typedef nsClassHashtable<nsUint64HashKey, mozilla::CSSIntRegion> VisibleRegions;
 
 } // namespace mozilla
 
-// 250ms.  This is actually pref-controlled, but we use this value if we fail
+// This is actually pref-controlled, but we use this value if we fail
 // to get the pref for any reason.
+#ifdef MOZ_WIDGET_ANDROID
 #define PAINTLOCK_EVENT_DELAY 250
+#else
+#define PAINTLOCK_EVENT_DELAY 5
+#endif
 
 class PresShell final : public nsIPresShell,
                         public nsStubDocumentObserver,