Move code that doesn't depend on PPAPI out of remoting/client/plugin

remoting/client/plugin/empty_cursor_filter.cc

-// 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.
-
-#include "remoting/client/plugin/empty_cursor_filter.h"
-
-#include <algorithm>
-
-#include "remoting/proto/control.pb.h"
-
-namespace remoting {
-
-protocol::CursorShapeInfo EmptyCursorShape() {
-  protocol::CursorShapeInfo empty_shape;
-  empty_shape.set_data(std::string());
-  empty_shape.set_width(0);
-  empty_shape.set_height(0);
-  empty_shape.set_hotspot_x(0);
-  empty_shape.set_hotspot_y(0);
-  return empty_shape;
-}
-
-bool IsCursorShapeEmpty(const protocol::CursorShapeInfo& cursor_shape) {
-  return cursor_shape.width() <= 0 || cursor_shape.height() <= 0;
-}
-
-EmptyCursorFilter::EmptyCursorFilter(protocol::CursorShapeStub* cursor_stub)
-    : cursor_stub_(cursor_stub) {
-}
-
-EmptyCursorFilter::~EmptyCursorFilter() {}
-
-namespace {
-
-#if defined(ARCH_CPU_LITTLE_ENDIAN)
-const uint32_t kPixelAlphaMask = 0xff000000;
-#else  // !defined(ARCH_CPU_LITTLE_ENDIAN)
-const uint32_t kPixelAlphaMask = 0x000000ff;
-#endif  // !defined(ARCH_CPU_LITTLE_ENDIAN)
-
-// Returns true if |pixel| is not completely transparent.
-bool IsVisiblePixel(uint32_t pixel) {
-  return (pixel & kPixelAlphaMask) != 0;
-}
-
-// Returns true if there is at least one visible pixel in the given range.
-bool IsVisibleRow(const uint32_t* begin, const uint32_t* end) {
-  return std::find_if(begin, end, &IsVisiblePixel) != end;
-}
-
-}  // namespace
-
-void EmptyCursorFilter::SetCursorShape(
-    const protocol::CursorShapeInfo& cursor_shape) {
-  const uint32_t* src_row_data = reinterpret_cast<const uint32_t*>(
-      cursor_shape.data().data());
-  const uint32_t* src_row_data_end =
-      src_row_data + cursor_shape.width() * cursor_shape.height();
-  if (IsVisibleRow(src_row_data, src_row_data_end)) {
-    cursor_stub_->SetCursorShape(cursor_shape);
-    return;
-  }
-  cursor_stub_->SetCursorShape(EmptyCursorShape());
-}
-
-}  // namespace remoting