Make it possible to draw multiple paths at once to a draw target

src/gpu/gl/GrGpuGL_program.cpp

Index: src/gpu/gl/GrGpuGL_program.cpp
diff --git a/src/gpu/gl/GrGpuGL_program.cpp b/src/gpu/gl/GrGpuGL_program.cpp
index 50ecf0b3322d4a8b03280504e5fc1e03e868f1c7..10f10393e3b0f5310400b3e0b8238d4f5b4bdda4 100644
--- a/src/gpu/gl/GrGpuGL_program.cpp
+++ b/src/gpu/gl/GrGpuGL_program.cpp
@@ -251,7 +251,8 @@ bool GrGpuGL::flushGraphicsState(DrawType type, const GrDeviceCoordTexture* dstC
             return false;
         }
 
-        SkASSERT(kDrawPath_DrawType != type || !fCurrentProgram->hasVertexShader());
+        SkASSERT((kDrawPath_DrawType != type && kDrawPaths_DrawType != type)
+                 || !fCurrentProgram->hasVertexShader());
 
         fCurrentProgram.get()->ref();