Remove asserts on scissor size in Vulkan

src/gpu/vk/GrVkPipeline.cpp

Index: src/gpu/vk/GrVkPipeline.cpp
diff --git a/src/gpu/vk/GrVkPipeline.cpp b/src/gpu/vk/GrVkPipeline.cpp
index 055bb94d6f961e160b3f96246707e0ee5da20507..22ca90abcf539b50c3732eeedb296b28cbe7820b 100644
--- a/src/gpu/vk/GrVkPipeline.cpp
+++ b/src/gpu/vk/GrVkPipeline.cpp
@@ -506,9 +506,7 @@ void set_dynamic_scissor_state(GrVkGpu* gpu,
         scissor.extent.height = scissorState.rect().height();
 
         SkASSERT(scissor.offset.x >= 0);
-        SkASSERT(scissor.offset.x + scissor.extent.width <= (uint32_t)target.width());
         SkASSERT(scissor.offset.y >= 0);
-        SkASSERT(scissor.offset.y + scissor.extent.height <= (uint32_t)target.height());

[csmartdalton, 2016/07/22 20:54:48]

Ah, looks my change gave you grief. I also removed a similar assert in GL:

https://codereview.chromium.org/2160093002/diff/140001/src/gpu/gl/GrGLIRect.h

In GL, the only requirement is that width and height are non-negative. Should we
also remove the asserts that x,y >= 0? (I'd be surprised if vulkan allowed you
to overstep the right edge, but not the left.)

     } else {
         scissor.extent.width = target.width();
         scissor.extent.height = target.height();