Pass resourceless software mode in BeginFrameArgs

cc/output/software_renderer.cc

Index: cc/output/software_renderer.cc
diff --git a/cc/output/software_renderer.cc b/cc/output/software_renderer.cc
index 0f6babc30ec265011291edf6732bbefedab4fc2a..00e347ca8033db5e09b54544b46d0dd75c44f352 100644
--- a/cc/output/software_renderer.cc
+++ b/cc/output/software_renderer.cc
@@ -472,7 +472,7 @@ void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 
 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
                                     const TileDrawQuad* quad) {
-  DCHECK(!output_surface_->ForcedDrawToSoftwareDevice());
+  DCHECK(resource_provider_);

[danakj, 2014/07/10 18:33:59]

is this adding some value that i don't see? i'd just remove this line

[boliu, 2014/07/10 18:40:36]

This was supposed to check resourceless software draw never generates tile
quads. I could have added a method to RendererClient just to keep this DCHECK,
but I thought that was overkill, so added the somewhat equivalent
resource_provider_ check.

Umm, maybe just need a comment?

[danakj, 2014/07/10 18:43:21]

Oh, I see this is NULL in resourceless mode.

   DCHECK(IsSoftwareResource(quad->resource_id));
 
   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,