Print stack in devtool exception warning

Author: sophiebits

src/isomorphic/ReactDebugTool.js

@@ -31,7 +31,7 @@ function emitEvent(handlerFunctionName, arg1, arg2, arg3, arg4, arg5) {
           handlerDoesThrowForEvent[handlerFunctionName],
           'exception thrown by devtool while handling %s: %s',
           handlerFunctionName,
-          e.message
+          e + '\n' + e.stack
         );
         handlerDoesThrowForEvent[handlerFunctionName] = true;
       }

src/isomorphic/__tests__/ReactDebugTool-test.js

@@ -66,7 +66,7 @@ describe('ReactDebugTool', function() {
     expect(console.error.calls.length).toBe(1);
     expect(console.error.argsForCall[0][0]).toContain(
       'exception thrown by devtool while handling ' +
-      'onTestEvent: Hi.'
+      'onTestEvent: Error: Hi.'
     );
 
     ReactDebugTool.onTestEvent();

src/renderers/dom/shared/ReactDOMDebugTool.js

@@ -30,7 +30,7 @@ function emitEvent(handlerFunctionName, arg1, arg2, arg3, arg4, arg5) {
           handlerDoesThrowForEvent[handlerFunctionName],
           'exception thrown by devtool while handling %s: %s',
           handlerFunctionName,
-          e.message
+          e + '\n' + e.stack
         );
         handlerDoesThrowForEvent[handlerFunctionName] = true;
       }

src/renderers/dom/shared/__tests__/ReactDOMDebugTool-test.js

@@ -66,7 +66,7 @@ describe('ReactDOMDebugTool', function() {
     expect(console.error.calls.length).toBe(1);
     expect(console.error.argsForCall[0][0]).toContain(
       'exception thrown by devtool while handling ' +
-      'onTestEvent: Hi.'
+      'onTestEvent: Error: Hi.'
     );
 
     ReactDOMDebugTool.onTestEvent();