Implemented typo recognition in Chrome for Android.

chrome/browser/spellchecker/spellchecker_session_bridge_android.h

+// 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 CHROME_BROWSER_SPELLCHECKER_SPELLCHECKER_SESSION_BRIDGE_ANDROID_H_
+#define CHROME_BROWSER_SPELLCHECKER_SPELLCHECKER_SESSION_BRIDGE_ANDROID_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_array.h"

[newt (away), 2015/08/12 16:12:58]

remove unneeded imports (jni_array.h and jni_string.h appear unused). OTOH, you
need imports for base::string16 and base::android::ScopedJavaGlobalRef

[dylanking, 2015/08/13 02:10:03]

jni_array.h and jni_string.h are needed for the parameter types of
ProcessSpellCheckResults.  

Imported scoped_java_ref and string16, thanks!

+#include "base/android/jni_string.h"
+
+// Owned by the SpellCheckMessageFilterPlatform.  This class is used to
+// interface between the android message filter and the Java class of the
+// same name.  This class is sent text to be spellchecked from
+// the message filter, then sends that text to the Java side via JNI to be
+// spellchecked, and finally processes those results and sends them to the
+// renderer.
+class SpellCheckerSessionBridge {
+ public:
+  explicit SpellCheckerSessionBridge(int render_process_id);
+  ~SpellCheckerSessionBridge();
+  static bool RegisterSpellCheckerSessionBridge(JNIEnv* env);

[please use gerrit instead, 2015/08/12 17:05:54]

Where do you call this?

[please use gerrit instead, 2015/08/12 17:05:54]

Since you've put this function inside of a class, you can call it Register().
It's already obvious what you're registering. Your call to register becomes:

SpellCheckerSessionBridge::Register(env);

Instead of this:

SpellCheckerSessionBridge::RegisterSpellCheckSessionBridge(env);

[newt (away), 2015/08/12 20:08:35]

Or call it "RegisterJNI", which is clear and concise.

[dylanking, 2015/08/13 02:10:03]

There's some information about this here, but I'm not 100% where this gets
called.  My JNI works fine.  Will investigate further tomorrow (have to run for
the day):
https://code.google.com/p/chromium/codesearch#chromium/src/base/android/jni_g...

It seems that the naming convention on the Register method is inconsistent
across the codebase. Some classes do Register(), some do RegisterJNI(), some do
RegisterFullClassName(). 

I'll change mine to RegisterJNI() as that's what the Chromium JNI Guidelines
have and I believe it's the most descriptive without being too verbose.

+
+  // Receives text to be checked from the message filter and sends it to Java
+  // to be spellchecked.
+  void RequestTextCheck(int route_id,
+                        int identifier,
+                        const base::string16& text);
+
+  // Receives information from Java side about the typos in a given string
+  // of text, processes these and sends them to the renderer.
+  void ProcessSpellCheckResults(JNIEnv* env,
+                                jobject jobj,
+                                jint route_id,
+                                jint identifier,
+                                jstring text,
+                                jintArray offsetArray,

[please use gerrit instead, 2015/08/12 17:05:54]

C++ parameters should_use_underscores_in_names.

[dylanking, 2015/08/13 02:10:03]

Thanks, done.

+                                jintArray lengthArray);
+
+ private:
+  int render_process_id_;
+  base::android::ScopedJavaGlobalRef<jobject> java_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpellCheckerSessionBridge);
+};
+
+#endif  // CHROME_BROWSER_SPELLCHECKER_SPELLCHECKER_SESSION_BRIDGE_ANDROID_H_