Bug 1847336 [Linux] Skip frame rendering if we don't have EGL window to paint into r=sotaro

If SetEGLNativeWindowSize() returns false window size put to SetEGLNativeWindowSize() doesn't match screen scale and
will lead to Wayland protocol error. Skip this frame rendering and wait for new window size provided by layout.

Depends on D187890

Differential Revision: https://phabricator.services.mozilla.com/D187891

gfx/layers/opengl/CompositorOGL.cpp

@@ -747,7 +747,10 @@ Maybe<IntRect> CompositorOGL::BeginFrame(const nsIntRegion& aInvalidRegion,
     mWidgetSize = LayoutDeviceIntSize::FromUnknownSize(rect.Size());
 #ifdef MOZ_WIDGET_GTK
     if (mWidget && mWidget->AsGTK()) {
-      mWidget->AsGTK()->SetEGLNativeWindowSize(mWidgetSize);
+      if (!mWidget->AsGTK()->SetEGLNativeWindowSize(mWidgetSize)) {
+        // We don't have correct window size to paint into.
+        return Nothing();
+      }
     }
 #endif
   } else {

gfx/webrender_bindings/RenderCompositorEGL.cpp

@@ -90,7 +90,11 @@ bool RenderCompositorEGL::BeginFrame() {
   }
 #ifdef MOZ_WIDGET_GTK
   if (mWidget->AsGTK()) {
-    mWidget->AsGTK()->SetEGLNativeWindowSize(GetBufferSize());
+    if (!mWidget->AsGTK()->SetEGLNativeWindowSize(GetBufferSize())) {
+      gfxCriticalNote
+          << "We don't have GTK/EGLWindow with correct size, can't draw.";
+      return false;
+    }
   }
 #endif
   if (!MakeCurrent()) {