Adding chrome side entries for Asm.js / WebAssembly metrics.

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 0456101cecee8fd1c9b0ee2b5115a44975099f27..94137550b2a568206e0758d1c0e2475497389e1f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -71928,6 +71928,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="V8.AsmWasmTranslationMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <owner>aseemgarg@chromium.org</owner>
+  <summary>Time to convert asm.js code to WebAssembly.</summary>
+</histogram>
+
 <histogram name="V8.ASTOptimization">
   <obsolete>
     This histogram is no longer present in V8.
@@ -72566,6 +72573,84 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>TBD</summary>
 </histogram>
 
+<histogram name="V8.WasmCompileFunctionMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to compile a WebAssembly function.</summary>
+</histogram>
+
+<histogram name="V8.WasmCompileFunctionPeakMemoryBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Peak memory used to compile a WebAssembly function.</summary>
+</histogram>
+
+<histogram name="V8.WasmCompileModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to compile a WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeFunctionMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to decode a WebAssembly function.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to decode a WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeModulePeakMemoryBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Peak memory used to decode a WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmFunctionSizeBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Size of a WebAssembly function.</summary>
+</histogram>
+
+<histogram name="V8.WasmFunctionsPerModule" units="functions">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Function count in each WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmInstantiateModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to instantiate a WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmMaxMemPagesCount" units="pages">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>
+    Number of 64KiB pages a WebAssembly module declares as its maximum
+    requirement.
+  </summary>
+</histogram>
+
+<histogram name="V8.WasmMinMemPagesCount" units="pages">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>
+    Number of 64KiB pages a WebAssembly module declares as its minimum
+    requirement.
+  </summary>
+</histogram>
+
+<histogram name="V8.WasmModuleSizeBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Size of a WebAssembly module.</summary>
+</histogram>
+
 <histogram name="Variations.CreateTrials.SeedExpiry"
     enum="VariationsSeedExpiry">
   <owner>asvitkine@chromium.org</owner>