[Bindings] Create and use V8 context snapshots

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index f7360bf6cb93be8d78ffe7b66497474390e0ac11..a1a94f92a8c570464eefff2b612d198bc189849b 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -674,6 +674,10 @@ class BLINK_PLATFORM_EXPORT Platform {
   // depending on memory pressure.
   virtual void RequestPurgeMemory() {}
 
+  // V8 Context Snapshot --------------------------------------------------
+
+  virtual bool TakeV8Snapshot() { return false; }

[Yuki, 2017/06/01 14:15:51]

Can we give a predictor-like name to this function?

  v8::StartupData TakeSnapshot() { ... }
makes good sense but
  bool TakeSnapshot() { ... }
does not.

[peria, 2017/06/20 10:20:14]

Done.

+
   // Feature Policy -----------------------------------------------------
 
   // Create a new feature policy object for a document, given its parent