Add tests and extension verifying CHECK and ASSERT.

src/extensions/trigger-failure-extension.h

 // Copyright 2013 the V8 project authors. All rights reserved.
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-#ifndef V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_
-#define V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_
+#ifndef V8_EXTENSIONS_TRIGGER_FAILURE_EXTENSION_H_
+#define V8_EXTENSIONS_TRIGGER_FAILURE_EXTENSION_H_
 
 #include "v8.h"
 
 namespace v8 {
 namespace internal {
 
-class FreeBufferExtension : public v8::Extension {
+class TriggerFailureExtension : public v8::Extension {
  public:
-  explicit FreeBufferExtension(const char* source)
-      : v8::Extension("v8/free-buffer", source) {}
+  TriggerFailureExtension() : v8::Extension("v8/trigger-failure", kSource) {}
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
       v8::Isolate* isolate,
       v8::Handle<v8::String> name);
-  static void FreeBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void TriggerCheckFalse(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void TriggerAssertFalse(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void TriggerSlowAssertFalse(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Register();
+
+ private:
+  static const char* const kSource;
 };
 
 } }  // namespace v8::internal
 
-#endif  // V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_
+#endif  // V8_EXTENSIONS_TRIGGER_FAILURE_EXTENSION_H_