Support InputMethodManager#updateCursorAnchorInfo for Android 5.0

ui/base/ime/android/cursor_anchor_info_builder.h

+// Copyright 2014 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 UI_BASE_ANDROID_CURSOR_ANCHOR_INFO_BUILDER_H_
+#define UI_BASE_ANDROID_CURSOR_ANCHOR_INFO_BUILDER_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+#include "ui/base/ui_base_export.h"
+#include "ui/gfx/geometry/matrix3_f.h"
+#include "ui/gfx/geometry/rect_f.h"
+#include "ui/gfx/range/range.h"
+
+namespace ui {
+
+class UI_BASE_EXPORT CursorAnchorInfoBuilder {
+ public:
+  enum Flags {

[jdduke (slow), 2015/01/14 17:17:09]

I'm a little wary of duplicating these constants.  Could you add a comment
dictating where these values came from? 

Alternatively, we could introduce an intermediate enum shared between C++/Java,
then translate in the Java side between the two? See
https://code.google.com/p/chromium/codesearch#chromium/src/ui/touch_selection...
for an example of how to do that.

I dunno, maybe that's overkill?

[yukawa, 2015/01/14 22:21:59]

Added comment.  Those values are actually defined in Android Framework.

+    kFlagHasVisibleRegion = 0x01,
+    kFlagHasInvisibleRegion = 0x02,
+    kFlagIsRtl = 0x04,
+  };
+
+  virtual ~CursorAnchorInfoBuilder();
+
+  virtual void AddCharacterBounds(int index,
+                                  const gfx::RectF& rect,
+                                  uint32 flags) = 0;
+  virtual base::android::ScopedJavaLocalRef<jobject> Build() = 0;
+  virtual void Reset() = 0;
+  virtual void SetComposingText(int composingTextStart,
+                                base::StringPiece16 composingText) = 0;
+  virtual void SetInsertionMarkerLocation(float horizontalPosition,
+                                          float lineTop,
+                                          float lineBaseline,
+                                          float lineBottom,
+                                          uint32 flags) = 0;
+  virtual void SetMatrix(const gfx::Matrix3F& matrix) = 0;
+  virtual void SetSelectionRange(const gfx::Range& range) = 0;
+
+  static scoped_ptr<CursorAnchorInfoBuilder> Create();
+  static bool Register(JNIEnv* env);
+
+ protected:
+  CursorAnchorInfoBuilder();
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_ANDROID_CURSOR_ANCHOR_INFO_BUILDER_H_