Turn test runner library into an actual component

components/test_runner/web_test_proxy.cc

Index: components/test_runner/web_test_proxy.cc
diff --git a/components/test_runner/web_test_proxy.cc b/components/test_runner/web_test_proxy.cc
index b021480cbdd229930586915fa765c57514e657a6..766459d30835f462fe8612710ce9bcaba15d8a72 100644
--- a/components/test_runner/web_test_proxy.cc
+++ b/components/test_runner/web_test_proxy.cc
@@ -379,7 +379,8 @@ std::string DumpAllBackForwardLists(TestInterfaces* interfaces,
 }
 
 WebTestProxyBase::WebTestProxyBase()
-    : test_interfaces_(NULL),
+    : web_test_interfaces_(NULL),
+      test_interfaces_(NULL),
       delegate_(NULL),
       web_widget_(NULL),
       spellcheck_(new SpellCheckClient(this)),
@@ -392,10 +393,15 @@ WebTestProxyBase::~WebTestProxyBase() {
 }
 
 void WebTestProxyBase::SetInterfaces(WebTestInterfaces* interfaces) {
+  web_test_interfaces_ = interfaces;
   test_interfaces_ = interfaces->GetTestInterfaces();
   test_interfaces_->WindowOpened(this);
 }
 
+WebTestInterfaces* WebTestProxyBase::GetInterfaces() {
+  return web_test_interfaces_;
+}
+
 void WebTestProxyBase::SetDelegate(WebTestDelegate* delegate) {
   delegate_ = delegate;
   spellcheck_->SetDelegate(delegate);
@@ -403,6 +409,10 @@ void WebTestProxyBase::SetDelegate(WebTestDelegate* delegate) {
     speech_recognizer_->SetDelegate(delegate);
 }
 
+WebTestDelegate* WebTestProxyBase::GetDelegate() {
+  return delegate_;
+}
+
 blink::WebView* WebTestProxyBase::GetWebView() const {
   DCHECK(web_widget_);
   // TestRunner does not support popup widgets. So |web_widget|_ is always a