[vulkan] Add histogram for spirv-val time.

Add a histogram to track the time taken running the SPIR-V validator.

Bug: 357132378
Change-Id: Iae465b1cfdb76bb678cd6e65b3d4f9b3831570a0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/280576
Commit-Queue: James Price <jrprice@google.com>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Auto-Submit: dan sinclair <dsinclair@chromium.org>
Reviewed-by: James Price <jrprice@google.com>

Author: dj2

src/dawn/native/vulkan/ShaderModuleVk.cpp

@@ -360,10 +360,15 @@ ResultOrError<ShaderModule::ModuleAndSpirv> ShaderModule::GetHandleAndSpirv(
         "Vulkan.CompileShaderToSPIRV");
 
 #ifdef DAWN_ENABLE_SPIRV_VALIDATION
-    // Validate and if required dump the compiled SPIR-V code.
-    const bool spv14 = GetDevice()->IsToggleEnabled(Toggle::UseSpirv14);
-    DAWN_TRY(
-        ValidateSpirv(GetDevice(), compilation->spirv.data(), compilation->spirv.size(), spv14));
+    {
+        SCOPED_DAWN_HISTOGRAM_TIMER_MICROS(GetDevice()->GetPlatform(), "Vulkan.ValidateSpirv");
+
+        // Validate and if required dump the compiled SPIR-V code.
+        const bool spv14 = GetDevice()->IsToggleEnabled(Toggle::UseSpirv14);
+        DAWN_TRY(ValidateSpirv(GetDevice(), compilation->spirv.data(), compilation->spirv.size(),
+                               spv14));
+    }
+
     if (GetDevice()->IsToggleEnabled(Toggle::DumpShaders)) {
         DumpSpirv(GetDevice(), compilation->spirv.data(), compilation->spirv.size());
     }