fix [3095607] Gingerbread screen turn-on animation does not show the last frame

always redraw the screen entirely after the power-on animation, because:
- the animation may not run (ie: on the emu)
- the animation may not contain the video planes
- the interpolation may not be perfect and not land exactly on the last frame

Change-Id: I9ba40f537b1e94464f8a3ed6f81e7c2f552df51d
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 073ce01..a975480 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1915,9 +1915,6 @@
 
 status_t SurfaceFlinger::turnElectronBeamOff(int32_t mode)
 {
-    if (!GLExtensions::getInstance().haveFramebufferObject())
-        return INVALID_OPERATION;
-
     class MessageTurnElectronBeamOff : public MessageBase {
         SurfaceFlinger* flinger;
         status_t result;
@@ -1959,14 +1956,16 @@
     }
     electronBeamOnAnimationImplLocked();
     hw.setCanDraw(true);
+
+    // make sure to redraw the whole screen when the animation is done
+    mDirtyRegion.set(hw.bounds());
+    signalEvent();
+
     return NO_ERROR;
 }
 
 status_t SurfaceFlinger::turnElectronBeamOn(int32_t mode)
 {
-    if (!GLExtensions::getInstance().haveFramebufferObject())
-        return INVALID_OPERATION;
-
     class MessageTurnElectronBeamOn : public MessageBase {
         SurfaceFlinger* flinger;
         status_t result;