aw: Skip hardware onDraw when visible rect is empty

android_webview/browser/hardware_renderer.cc

Index: android_webview/browser/hardware_renderer.cc
diff --git a/android_webview/browser/hardware_renderer.cc b/android_webview/browser/hardware_renderer.cc
index 28cec803ab7a589801d844c1e0c48f30689078d1..c2737af172d6234aa7df3bbcea516c5f09e8590e 100644
--- a/android_webview/browser/hardware_renderer.cc
+++ b/android_webview/browser/hardware_renderer.cc
@@ -139,10 +139,9 @@ void HardwareRenderer::DidBeginMainFrame() {
 
 void HardwareRenderer::CommitFrame() {
   scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
-  if (!input.get()) {
-    DLOG(WARNING) << "No frame to commit";
+  // Happens with empty global visible rect.
+  if (!input.get())
     return;
-  }
 
   DCHECK(!input->frame.gl_frame_data);
   DCHECK(!input->frame.software_frame_data);
@@ -192,11 +191,6 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
     return;
   }
 
-  if (!delegated_layer_.get()) {
-    DLOG(ERROR) << "No frame committed";
-    return;
-  }
-
   // TODO(boliu): Handle context loss.
   if (last_egl_context_ != current_context)
     DLOG(WARNING) << "EGLContextChanged";
@@ -216,6 +210,9 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
         draw_constraints);
   }
 
+  if (!delegated_layer_.get())
+    return;
+
   viewport_.SetSize(draw_info->width, draw_info->height);
   layer_tree_host_->SetViewportSize(viewport_);
   clip_.SetRect(draw_info->clip_left,