Adds support for POST request with bodies on WKWebView.

ios/web/web_state/js/crw_js_post_request_loader.h

Index: ios/web/web_state/js/crw_js_post_request_loader.h
diff --git a/ios/web/web_state/js/crw_js_post_request_loader.h b/ios/web/web_state/js/crw_js_post_request_loader.h
new file mode 100644
index 0000000000000000000000000000000000000000..13297e15188595a88e67da9125620a3c3457b88d
--- /dev/null
+++ b/ios/web/web_state/js/crw_js_post_request_loader.h
@@ -0,0 +1,18 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_WEB_WEB_STATE_JS_CRW_JS_HTML_LOADER_H_

[Eugene But (OOO till 7-30), 2015/10/08 17:46:32]

This does not match filename

[stkhapugin, 2015/12/03 15:43:01]

Done.

+#define IOS_WEB_WEB_STATE_JS_CRW_JS_HTML_LOADER_H_
+
+#import <WebKit/WKWebView.h>
+
+// Class to load POST requests in a provided web view via JavaScript.
+@interface CRWJSPOSTRequestLoader : NSObject

[Eugene But (OOO till 7-30), 2015/10/08 17:46:32]

Do we need a class here? Can we have a function instead?

[stkhapugin, 2015/12/03 15:43:00]

We need a class here because we want to cache the javascript from the file.

+
+// Asynchronously loads a POST |request| in provided |webView|.
+- (void)loadPOSTRequest:(NSURLRequest*)request inWebView:(WKWebView*)webView;

[Eugene But (OOO till 7-30), 2015/10/08 17:46:32]

This needs a unit test

[stkhapugin, 2015/12/03 15:43:01]

Done.

+
+@end
+
+#endif  // IOS_WEB_WEB_STATE_JS_CRW_JS_HTML_LOADER_H_