bindings: Add toBoolean() to V8Binding.h

Source/bindings/core/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 90 matching lines @@
     RefPtrWillBeRawPtr<NodeFilter> filter = NodeFilter::create();
 
     v8::Handle<v8::Object> filterWrapper = toV8(filter.get(), creationContext, scriptState->isolate()).As<v8::Object>();
 
     RefPtrWillBeRawPtr<NodeFilterCondition> condition = V8NodeFilterCondition::create(callback, filterWrapper, scriptState);
     filter->setCondition(condition.release());
 
     return filter.release();
 }
 
+bool toBooleanSlow(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState)
+{
+    ASSERT(!value->IsBoolean());
+    v8::TryCatch block;
+    bool result = false;
+    if (!v8Call(value->BooleanValue(isolate->GetCurrentContext()), result, block))
+        exceptionState.rethrowV8Exception(block.Exception());
+    return result;
+}
+
 const int32_t kMaxInt32 = 0x7fffffff;
 const int32_t kMinInt32 = -kMaxInt32 - 1;
 const uint32_t kMaxUInt32 = 0xffffffff;
 const int64_t kJSMaxInteger = 0x20000000000000LL - 1; // 2^53 - 1, maximum uniquely representable integer in ECMAScript.
 
 static double enforceRange(double x, double minimum, double maximum, const char* typeName, ExceptionState& exceptionState)
 {
     if (std::isnan(x) || std::isinf(x)) {
         exceptionState.throwTypeError("Value is" + String(std::isinf(x) ? " infinite and" : "") + " not of type '" + String(typeName) + "'.");
         return 0;
@@ skipping 852 matching lines @@
     v8::Local<v8::Value> data = info.Data();
     ASSERT(data->IsExternal());
     V8PerContextData* perContextData = V8PerContextData::from(info.Holder()->CreationContext());
     if (!perContextData)
         return;
     v8SetReturnValue(info, perContextData->constructorForType(WrapperTypeInfo::unwrap(data)));
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 } // namespace blink