Add a mojo channel for frame messages.

content/common/input/input_handler.mojom

+// Copyright 2017 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.
+
+module content.mojom;
+
+import "mojo/common/string16.mojom";
+import "services/ui/public/interfaces/ime/ime.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
+interface WidgetInputHandler
+{
+  // TODO(dtapuska): Implement me.
+};
+
+// This interface provides the input actions associated with the RenderFrame.
+// Other input actions may also be dispatched via the WidgetInputHandler
+// interface. If frame input actions are dispatched the WidgetInputHandler
+// should be fetched via the associated interface request so that input calls
+// remain in order. See https://goo.gl/x4ee8A for more details.
+interface FrameInputHandler
+{
+  // Sets the text composition to be between the given start and end offsets in
+  // the currently focused editable field.
+  SetCompositionFromExistingText(int32 start, int32 end, array<ui.mojom.CompositionUnderline> underlines);

[dcheng, 2017/05/25 00:03:58]

Nit: 80 chars

[dtapuska, 2017/05/26 14:02:06]

Done. Although git cl format doesn't clang format mojom files it seems.

+
+  // Deletes the current selection plus the specified number of characters
+  // before and after the selection or caret.
+  ExtendSelectionAndDelete(int32 before, int32 after);
+
+  // Deletes text before and after the current cursor position, excluding the
+  // selection. The lengths are supplied in Java chars (UTF-16 Code Unit),
+  // not in code points or in glyphs.
+  DeleteSurroundingText(int32 before, int32 after);
+
+  // Deletes text before and after the current cursor position, excluding the
+  // selection. The lengths are supplied in code points, not in Java chars
+  // (UTF-16 Code Unit) or in glyphs. Does nothing if there are one or more
+  // invalid surrogate pairs in the requested range
+  DeleteSurroundingTextInCodePoints(int32 before, int32 after);
+  
+  // Selects between the given start and end offsets in the currently focused
+  // editable field.
+  SetEditableSelectionOffsets(int32 start, int32 end);
+  
+  // Message payload is the name/value of a WebCore edit command to execute.
+  ExecuteEditCommand(string command, mojo.common.mojom.String16? value);
+
+  // These messages are typically generated from context menus and request the
+  // renderer to apply the specified operation to the current selection.
+  Undo();
+  Redo();
+  Cut();
+  Copy();
+  CopyToFindPboard();
+  Paste();
+  PasteAndMatchStyle();
+  Delete();
+  SelectAll();
+  CollapseSelection();
+
+  // Replaces the selected region or a word around the cursor with the
+  // specified string.
+  Replace(mojo.common.mojom.String16 word);
+
+  // Replaces the misspelling in the selected region with the specified string.
+  ReplaceMisspelling(mojo.common.mojom.String16 word);
+
+  // Requests the renderer to select the region between two points.
+  // Expects a SelectRange_ACK message when finished.
+  SelectRange(gfx.mojom.Point base, gfx.mojom.Point extent);
+
+  // Sent by the browser to ask the renderer to adjust the selection start and
+  // end points by the given amounts. A negative amount moves the selection
+  // towards the beginning of the document, a positive amount moves the
+  // selection towards the end of the document.
+  AdjustSelectionByCharacterOffset(int32 start, int32 end);
+
+  // Requests the renderer to move the selection extent point to a new position.
+  // Expects a MoveRangeSelectionExtent_ACK message when finished.
+  MoveRangeSelectionExtent(gfx.mojom.Point extent);
+
+  // TODO(dtapuska): Implement WidgetInputHandler.
+  // GetWidgetInputHandler(associated WidgetInputHandler& interface_request);
+};