am 2d8d120d: Fix blank / partial screenshots

                        renderScreenImplLocked(hw, reqWidth, reqHeight,

                        renderScreenImplLocked(hw, reqWidth, reqHeight,

                                minLayerZ, maxLayerZ, true);

                                minLayerZ, maxLayerZ, true);

                        // Create a sync point and wait on it, so we know the buffer is

                        // ready before we pass it along.  We can't trivially call glFlush(),

                        // so we use a wait flag instead.

                        // TODO: pass a sync fd to queueBuffer() and let the consumer wait.

                        EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_FENCE_KHR, NULL);

                        if (sync != EGL_NO_SYNC_KHR) {

                            EGLint result = eglClientWaitSyncKHR(mEGLDisplay, sync,

                                    EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, 2000000000 /*2 sec*/);

                            EGLint eglErr = eglGetError();

                            eglDestroySyncKHR(mEGLDisplay, sync);

                            if (result == EGL_TIMEOUT_EXPIRED_KHR) {

                                ALOGW("captureScreen: fence wait timed out");

                            } else {

                                ALOGW_IF(eglErr != EGL_SUCCESS,

                                        "captureScreen: error waiting on EGL fence: %#x", eglErr);

                            }

                        } else {

                            ALOGW("captureScreen: error creating EGL fence: %#x", eglGetError());

                            // not fatal

                        }

                        if (DEBUG_SCREENSHOTS) {

                        if (DEBUG_SCREENSHOTS) {

                            uint32_t* pixels = new uint32_t[reqWidth*reqHeight];

                            uint32_t* pixels = new uint32_t[reqWidth*reqHeight];

                            getRenderEngine().readPixels(0, 0, reqWidth, reqHeight, pixels);

                            getRenderEngine().readPixels(0, 0, reqWidth, reqHeight, pixels);