Move JS-related password manager code upstream

ios/chrome/browser/passwords/js_password_manager.mm

Index: ios/chrome/browser/passwords/js_password_manager.mm
diff --git a/ios/chrome/browser/passwords/js_password_manager.mm b/ios/chrome/browser/passwords/js_password_manager.mm
new file mode 100644
index 0000000000000000000000000000000000000000..6c47498d3e45218dee93e7f896bbb1320960e508
--- /dev/null
+++ b/ios/chrome/browser/passwords/js_password_manager.mm
@@ -0,0 +1,107 @@
+// Copyright 2012 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.
+
+#import "ios/chrome/browser/passwords/js_password_manager.h"
+
+#include "base/json/string_escape.h"
+#include "base/logging.h"
+#include "base/strings/sys_string_conversions.h"
+
+namespace {
+// Santizies |str| and wraps it in quotes so it can be injected safely in
+// JavaScript.
+NSString* JSONEscape(NSString* str) {

[Eugene But (OOO till 7-30), 2015/11/18 17:06:48]

NIT: s/str/JSON here and in the comment

[vabr (Chromium), 2015/11/19 10:02:27]

Also here, I do not understand why the capitalisation.
My suggestion would be jsonString as in
ios/chrome/browser/passwords/js_password_manager.h.

[vabr (Chromium), 2015/11/19 16:45:02]

Change to JSONString to match the others.

+  return base::SysUTF8ToNSString(
+      base::GetQuotedJSONString(base::SysNSStringToUTF8(str)));
+}
+}  // namespace
+
+@interface JsPasswordManager ()
+// Injects a script that does two things:
+// 1. Injects password controller JavaScript in the page.
+// 2. Extracts the _submitted_ password form data from the DOM on the page.
+// The result is returned in |completionHandler|.
+// |completionHandler| cannot be nil.
+- (void)evaluateExtraScript:(NSString*)script
+          completionHandler:(void (^)(NSString*))completionHandler;
+@end
+
+@implementation JsPasswordManager
+
+- (void)findPasswordFormsWithCompletionHandler:
+    (void (^)(NSString*))completionHandler {
+  DCHECK(completionHandler);
+  [self evaluateExtraScript:@"__gCrWeb.findPasswordForms()"
+          completionHandler:completionHandler];
+}
+
+- (void)extractForm:(NSString*)formName
+  completionHandler:(void (^)(NSString*))completionHandler {

[Eugene But (OOO till 7-30), 2015/11/18 17:06:48]

Indent 4 spaces

[vabr (Chromium), 2015/11/19 10:02:27]

Cannot do, it conflicts with git cl format, and the presubmit says:
"The chrome directory requires source formatting. Please run git cl format
ios/chrome"

The internal bug for that is 25783407.

[Eugene But (OOO till 7-30), 2015/11/19 15:13:21]

This is a bug in clang format and presubmit message is just a warning not an
error. Following Style guide is required. And changing our code to workaround
clang format issues is not (especially where clang format gives incorrect
results).

[vabr (Chromium), 2015/11/19 16:45:02]

Fair enough, done.

+  DCHECK(completionHandler);
+  NSString* extra = [NSString
+      stringWithFormat:@"__gCrWeb.getPasswordForm(%@)", JSONEscape(formName)];
+  [self evaluateExtraScript:extra completionHandler:completionHandler];
+}
+
+- (void)fillPasswordForm:(NSString*)jsonString
+            withUsername:(NSString*)username
+                password:(NSString*)password
+       completionHandler:(void (^)(BOOL))completionHandler {
+  DCHECK(completionHandler);
+  NSString* script = [NSString
+      stringWithFormat:@"__gCrWeb.fillPasswordForm(%@, %@, %@)", jsonString,
+                       JSONEscape(username), JSONEscape(password)];
+  [self evaluate:script
+      stringResultHandler:^(NSString* result, NSError* error) {
+        completionHandler(!error && [result isEqualToString:@"true"]);
+      }];
+}
+
+- (void)clearAutofilledPasswordsInForm:(NSString*)formName
+                     completionHandler:(void (^)(BOOL))completionHandler {
+  NSString* script =
+      [NSString stringWithFormat:@"__gCrWeb.clearAutofilledPasswords(%@)",
+                                 JSONEscape(formName)];
+  [self evaluate:script
+      stringResultHandler:^(NSString* result, NSError* error) {
+        completionHandler(!error && [result isEqualToString:@"true"]);
+      }];
+}
+
+- (void)fillPasswordForm:(NSString*)formName
+   withGeneratedPassword:(NSString*)password
+       completionHandler:(void (^)(BOOL))completionHandler {
+  NSString* script =
+      [NSString stringWithFormat:
+                    @"__gCrWeb.fillPasswordFormWithGeneratedPassword(%@, %@)",
+                    JSONEscape(formName), JSONEscape(password)];
+  [self evaluate:script
+      stringResultHandler:^(NSString* result, NSError* error) {
+        if (completionHandler)
+          completionHandler(!error && [result isEqualToString:@"true"]);
+      }];
+}
+
+#pragma mark -
+#pragma mark ProtectedMethods
+
+- (NSString*)scriptPath {
+  return @"password_controller";
+}
+
+#pragma mark -
+#pragma mark Private
+
+- (void)evaluateExtraScript:(NSString*)script
+          completionHandler:(void (^)(NSString*))completionHandler {
+  DCHECK(completionHandler);
+  [self injectDependenciesIfMissing];
+  NSString* js = [[self injectionContent] stringByAppendingString:script];

[Eugene But (OOO till 7-30), 2015/11/18 17:06:48]

s/js/JS

[vabr (Chromium), 2015/11/19 10:02:27]

Same push-back as for jsonString in
ios/chrome/browser/passwords/js_password_manager.h.

[vabr (Chromium), 2015/11/19 16:45:02]

Done.

+  [self evaluate:js
+      stringResultHandler:^(NSString* result, NSError*) {
+        completionHandler(result);
+      }];
+}
+
+@end