Modify V8 histograms by adding asm/wasm suffices.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index ed085024e24521eec26a45d9d1327ecc03711c8c..9c2cfe358785f950255e73a73cf5d76b0810ab1a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -123896,6 +123896,21 @@ from previous Chrome versions.
   <affected-histogram name="V8.MemoryHeapUsed"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="V8WasmSeparateAsmAndWasm" separator=".">
+  <suffix name="asm" label="This histogram contains results for asm.js"/>
+  <suffix name="wasm" label="This histogram contains results for WASM modules"/>
+  <affected-histogram name="V8.WasmCompileModuleMicroSeconds"/>
+  <affected-histogram name="V8.WasmDecodeFunctionMicroSeconds"/>
+  <affected-histogram name="V8.WasmDecodeModuleMicroSeconds"/>
+  <affected-histogram name="V8.WasmDecodeModulePeakMemoryBytes"/>
+  <affected-histogram name="V8.WasmFunctionSizeBytes"/>
+  <affected-histogram name="V8.WasmFunctionsPerModule"/>
+  <affected-histogram name="V8.WasmInstantiateModuleMicroSeconds"/>
+  <affected-histogram name="V8.WasmMaxMemPagesCount"/>
+  <affected-histogram name="V8.WasmMinMemPagesCount"/>
+  <affected-histogram name="V8.WasmModuleSizeBytes"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="VideoEncodedQpStats" separator=".">
   <suffix name="H264"
       label="Video codec: H264. QP range: 0-51. No spatial layers."/>