Improve Crypto::getRandomValues exception messages.

Source/bindings/v8/ExceptionState.cpp

Index: Source/bindings/v8/ExceptionState.cpp
diff --git a/Source/bindings/v8/ExceptionState.cpp b/Source/bindings/v8/ExceptionState.cpp
index 6d666b35f3ee4acaf5cc48f0361ed36ac0c9814e..16f0c45b3a34dfbc0f6014b42b8dc260c1e7d1d1 100644
--- a/Source/bindings/v8/ExceptionState.cpp
+++ b/Source/bindings/v8/ExceptionState.cpp
@@ -31,6 +31,7 @@
 #include "config.h"
 #include "bindings/v8/ExceptionState.h"
 
+#include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/V8ThrowException.h"
 #include "core/dom/ExceptionCode.h"
 
@@ -50,8 +51,22 @@ void ExceptionState::throwDOMException(const ExceptionCode& ec, const String& me
     // SecurityError is thrown via ::throwSecurityError, and _careful_ consideration must be given to the data exposed to JavaScript via the 'sanitizedMessage'.
     ASSERT(ec != SecurityError);
 
+    String processedMessage = message;
+    if (propertyName() && interfaceName() && m_context != UnknownContext) {
+        if (m_context == DeletionContext)
+            processedMessage = ExceptionMessages::failedToDelete(propertyName(), interfaceName(), message);
+        else if (m_context == ExecutionContext)
+            processedMessage = ExceptionMessages::failedToExecute(propertyName(), interfaceName(), message);
+        else if (m_context == GetterContext)
+            processedMessage = ExceptionMessages::failedToGet(propertyName(), interfaceName(), message);
+        else if (m_context == SetterContext)
+            processedMessage = ExceptionMessages::failedToSet(propertyName(), interfaceName(), message);
+    } else if (!propertyName() && interfaceName() && m_context == ConstructionContext) {
+        processedMessage = ExceptionMessages::failedToConstruct(interfaceName(), message);
+    }
+
     m_code = ec;
-    setException(V8ThrowException::createDOMException(ec, message, m_creationContext, m_isolate));
+    setException(V8ThrowException::createDOMException(ec, processedMessage, m_creationContext, m_isolate));
 }
 
 void ExceptionState::throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage)