First pass at VulkanViewer

src/gpu/vk/GrVkMemory.cpp

Index: src/gpu/vk/GrVkMemory.cpp
diff --git a/src/gpu/vk/GrVkMemory.cpp b/src/gpu/vk/GrVkMemory.cpp
index 30a38066c27a3b75ac4a536c64f5324587aa003f..3227be5e71c993a89a96d237fd0691eefc9929c4 100644
--- a/src/gpu/vk/GrVkMemory.cpp
+++ b/src/gpu/vk/GrVkMemory.cpp
@@ -118,6 +118,8 @@ VkPipelineStageFlags GrVkMemory::LayoutToPipelineStageFlags(const VkImageLayout
         return VK_PIPELINE_STAGE_ALL_COMMANDS_BIT;
     } else if (VK_IMAGE_LAYOUT_PREINITIALIZED == layout) {
         return VK_PIPELINE_STAGE_HOST_BIT;
+    } else if (VK_IMAGE_LAYOUT_PRESENT_SRC_KHR == layout) {

[egdaniel, 2016/04/05 16:50:28]

We should probably comment on why this is the stage we are waiting at (even if
it really just arbitrary...) since it definitely isn't intuitive.

Actually I wonder if we actually even want to put these in here. Inside of
Ganesh we are neverusing LAYOUT_PRESENT, and the few places that do in our
windowing code can just hard code. Especially since when we use this stage as a
srcStageMask, it is actually being chosen because of a connected semaphore.

[jvanverth1, 2016/04/05 18:16:48]

Removed. 

+        return VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
     }
 
     SkASSERT(VK_IMAGE_LAYOUT_UNDEFINED == layout);
@@ -151,6 +153,8 @@ VkAccessFlags GrVkMemory::LayoutToSrcAccessMask(const VkImageLayout layout) {
         flags = VK_ACCESS_TRANSFER_READ_BIT;
     } else if (VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL == layout) {
         flags = VK_ACCESS_SHADER_READ_BIT;
+    } else if (VK_IMAGE_LAYOUT_PRESENT_SRC_KHR == layout) {
+        flags = VK_ACCESS_MEMORY_READ_BIT;
     }
     return flags;
 }