Add GrVkCopyPipeline to handle vulkan copies as draws

src/gpu/vk/GrVkUtil.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkUtil.h"
 
 #include "vk/GrVkGpu.h"
@@ skipping 294 matching lines @@
         }
         moduleCreateInfo.codeSize = code.size();
         moduleCreateInfo.pCode = (const uint32_t*)code.c_str();
 #else
         shaderc_compiler_t compiler = gpu->shadercCompiler();
 
         shaderc_compile_options_t options = shaderc_compile_options_initialize();
 
         shaderc_shader_kind shadercStage = vk_shader_stage_to_shaderc_kind(stage);
         result = shaderc_compile_into_spv(compiler,
-                                          shaderString.c_str(),
+                                          shaderString,
                                           strlen(shaderString),
                                           shadercStage,
                                           "shader",
                                           "main",
                                           options);
         shaderc_compile_options_release(options);
 #ifdef SK_DEBUG
         if (shaderc_result_get_num_errors(result)) {
             SkDebugf("%s\n", shaderString);
             SkDebugf("%s\n", shaderc_result_get_error_message(result));
@@ skipping 24 matching lines @@
     stageInfo->sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
     stageInfo->pNext = nullptr;
     stageInfo->flags = 0;
     stageInfo->stage = stage;
     stageInfo->module = *shaderModule;
     stageInfo->pName = "main";
     stageInfo->pSpecializationInfo = nullptr;
 
     return true;
 }