Bug 539356 - Part 22 - Force a background color when running android reftests. r=roc

layout/tools/reftest/reftest.js

@@ -260,6 +260,10 @@ function InitAndStartRefTests()
     } catch(e) {
         gDumpLog("REFTEST TEST-UNEXPECTED-FAIL | | EXCEPTION: " + e + "\n");
     }
+
+    try {
+      prefs.setBoolPref("android.widget_paints_background", false);
+    } catch (e) {}
     
     /* set the gLoadTimeout */
     try {

widget/android/nsLookAndFeel.cpp

@@ -98,7 +98,7 @@ nsLookAndFeel::NativeGetColor(ColorID aID, nscolor &aColor)
         // (except here at least TextSelectBackground and TextSelectForeground)
         // The CSS2 colors below are used.
     case eColorID_WindowBackground:
-        aColor = mSystemColors.colorBackground;
+        aColor = NS_RGB(0xFF, 0xFF, 0xFF);
         break;
     case eColorID_WindowForeground:
         aColor = mSystemColors.textColorPrimary;

widget/android/nsWindow.cpp

@@ -2247,6 +2247,10 @@ nsWindow::DrawWindowUnderlay(LayerManager* aManager, nsIntRect aRect)
 
     AndroidGeckoLayerClient& client = AndroidBridge::Bridge()->GetLayerClient();
     if (!client.CreateFrame(&jniFrame, mLayerRendererFrame)) return;
+    
+    if (!WidgetPaintsBackground())
+        return;
+
     if (!client.ActivateProgram(&jniFrame)) return;
     if (!mLayerRendererFrame.BeginDrawing(&jniFrame)) return;
     if (!mLayerRendererFrame.DrawBackground(&jniFrame)) return;
@@ -2316,5 +2320,21 @@ nsWindow::ScheduleResumeComposition(int width, int height)
     }
 }
 
+bool
+nsWindow::WidgetPaintsBackground()
+{
+    static bool sWidgetPaintsBackground = true;
+    static bool sWidgetPaintsBackgroundPrefCached = false;
+
+    if (!sWidgetPaintsBackgroundPrefCached) {
+        sWidgetPaintsBackgroundPrefCached = true;
+        mozilla::Preferences::AddBoolVarCache(&sWidgetPaintsBackground,
+                                              "android.widget_paints_background",
+                                              true);
+    }
+
+    return sWidgetPaintsBackground;
+}
+
 #endif
 

widget/android/nsWindow.h

@@ -158,7 +158,7 @@ public:
     static void SchedulePauseComposition();
     static void ScheduleResumeComposition(int width, int height);
 
-    virtual bool WidgetPaintsBackground() { return true; }
+    virtual bool WidgetPaintsBackground();
 #endif
 
 protected: