Add isMultisampled() to GrRenderTarget. Cleanup MSAA vs smooth lines logic in GrGpuGL.

Skia issue: 178

Review URL: http://codereview.appspot.com/4382041/



git-svn-id: http://skia.googlecode.com/svn/trunk@1067 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGpu.cpp b/gpu/src/GrGpu.cpp
index 06de3ac..4aaed79 100644
--- a/gpu/src/GrGpu.cpp
+++ b/gpu/src/GrGpu.cpp
@@ -144,10 +144,12 @@
 
 GrRenderTarget* GrGpu::createPlatformRenderTarget(intptr_t platformRenderTarget,
                                                   int stencilBits,
+                                                  bool isMultisampled,
                                                   int width, int height) {
     this->handleDirtyContext();
     return this->createPlatformRenderTargetHelper(platformRenderTarget,
                                                   stencilBits,
+                                                  isMultisampled,
                                                   width, height);
 }