Set up cache in vulkan to reuse GrVkPrograms (aka VkPipelines)

src/gpu/vk/GrVkGpu.cpp

Index: src/gpu/vk/GrVkGpu.cpp
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index 5e25ede9be38e97cac5a9c46f63367449912aa66..3111d37fd754fbf2d6bf3f8c016d5c240a46340a 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -528,12 +528,6 @@ GrTexture* GrVkGpu::onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::Li
     if (renderTarget) {
         tex = GrVkTextureRenderTarget::CreateNewTextureRenderTarget(this, desc, lifeCycle,
                                                                     imageDesc);
-#if 0
-        // This clear can be included to fix warning described in htttps://bugs.skia.org/5045
-        // Obviously we do not want to be clearling needlessly every time we create a render target.
-        SkIRect rect = SkIRect::MakeWH(tex->width(), tex->height());
-        this->clear(rect, GrColor_TRANSPARENT_BLACK, tex->asRenderTarget());
-#endif
     } else {
         tex = GrVkTexture::CreateNewTexture(this, desc, lifeCycle, imageDesc);
     }
@@ -1314,25 +1308,15 @@ bool GrVkGpu::onReadPixels(GrSurface* surface,
 
     return true;
 }
-
 bool GrVkGpu::prepareDrawState(const GrPipeline& pipeline,
                                const GrPrimitiveProcessor& primProc,
                                GrPrimitiveType primitiveType,
                                const GrVkRenderPass& renderPass,
                                GrVkProgram** program) {
-    // Get GrVkProgramDesc
-    GrVkProgramDesc desc;
-    if (!GrVkProgramDescBuilder::Build(&desc, primProc, pipeline, *this->vkCaps().glslCaps())) {
-        GrCapsDebugf(this->caps(), "Failed to vk program descriptor!\n");
-        return false;
-    }
-
-    *program = GrVkProgramBuilder::CreateProgram(this,
-                                                 pipeline,
-                                                 primProc,
-                                                 primitiveType,
-                                                 desc,
-                                                 renderPass);
+    *program = fResourceProvider.findOrCreateCompatibleProgram(pipeline,
+                                                               primProc,
+                                                               primitiveType,
+                                                               renderPass);
     if (!program) {
         return false;
     }
@@ -1456,9 +1440,6 @@ void GrVkGpu::onDraw(const GrPipeline& pipeline,
     // but this will allow for quicker freeing of resources if the program sits in a cache for a
     // while.
     program->freeTempResources(this);
-    // This free will go away once we setup a program cache, and then the cache will be responsible
-    // for call freeGpuResources.
-    program->freeGPUResources(this);
     program->unref();
 
 #if SWAP_PER_DRAW