Remove parts of //cc we aren't using

cc/resources/content_layer_updater.cc

-// Copyright 2011 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 "cc/resources/content_layer_updater.h"
-
-#include "base/trace_event/trace_event.h"
-#include "cc/resources/layer_painter.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkRect.h"
-#include "third_party/skia/include/core/SkScalar.h"
-#include "ui/gfx/geometry/rect_conversions.h"
-#include "ui/gfx/geometry/rect_f.h"
-#include "ui/gfx/skia_util.h"
-
-namespace cc {
-
-ContentLayerUpdater::ContentLayerUpdater(scoped_ptr<LayerPainter> painter,
-                                         int layer_id)
-    : layer_id_(layer_id),
-      layer_is_opaque_(false),
-      layer_fills_bounds_completely_(false),
-      painter_(painter.Pass()),
-      background_color_(SK_ColorTRANSPARENT) {
-}
-
-ContentLayerUpdater::~ContentLayerUpdater() {}
-
-void ContentLayerUpdater::PaintContents(SkCanvas* canvas,
-                                        const gfx::Size& layer_content_size,
-                                        const gfx::Rect& paint_rect,
-                                        float contents_width_scale,
-                                        float contents_height_scale) {
-  TRACE_EVENT0("cc", "ContentLayerUpdater::PaintContents");
-  if (!canvas)
-    return;
-  canvas->save();
-  canvas->translate(SkIntToScalar(-paint_rect.x()),
-                    SkIntToScalar(-paint_rect.y()));
-
-  // The |canvas| backing should be sized to hold the |paint_rect|.
-  DCHECK_EQ(paint_rect.width(), canvas->getBaseLayerSize().width());
-  DCHECK_EQ(paint_rect.height(), canvas->getBaseLayerSize().height());
-
-  const bool is_scaled =
-      contents_width_scale != 1.f || contents_height_scale != 1.f;
-
-  if (is_scaled && (layer_is_opaque_ || layer_fills_bounds_completely_)) {
-    // Even if completely covered, for rasterizations that touch the edge of the
-    // layer, we also need to raster the background color underneath the last
-    // texel (since the paint won't cover it).
-    //
-    // The final texel of content may only be partially covered by a
-    // rasterization; this rect represents the content rect that is fully
-    // covered by content.
-    const gfx::Rect layer_content_rect = gfx::Rect(layer_content_size);
-    gfx::Rect deflated_layer_content_rect = layer_content_rect;
-    deflated_layer_content_rect.Inset(0, 0, 1, 1);
-
-    if (!layer_content_rect.Contains(deflated_layer_content_rect)) {
-      // Drawing at most 1 x 1 x (canvas width + canvas height) texels is 2-3X
-      // faster than clearing, so special case this.
-      DCHECK_LE(paint_rect.right(), layer_content_rect.right());
-      DCHECK_LE(paint_rect.bottom(), layer_content_rect.bottom());
-      canvas->save();
-      canvas->clipRect(gfx::RectToSkRect(layer_content_rect),
-                       SkRegion::kReplace_Op);
-      canvas->clipRect(gfx::RectToSkRect(deflated_layer_content_rect),
-                       SkRegion::kDifference_Op);
-      canvas->drawColor(background_color_, SkXfermode::kSrc_Mode);
-      canvas->restore();
-    }
-  }
-
-  gfx::Rect layer_rect;
-  if (is_scaled) {
-    canvas->scale(SkFloatToScalar(contents_width_scale),
-                  SkFloatToScalar(contents_height_scale));
-
-    // NOTE: this may go beyond the bounds of the layer, but that shouldn't
-    // cause problems (anything beyond the layer is clipped out).
-    layer_rect = gfx::ScaleToEnclosingRect(
-        paint_rect, 1.f / contents_width_scale, 1.f / contents_height_scale);
-  } else {
-    layer_rect = paint_rect;
-  }
-
-  SkRect layer_sk_rect = SkRect::MakeXYWH(
-      layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height());
-
-  canvas->clipRect(layer_sk_rect);
-
-  // If the layer has opaque contents or will fill the bounds completely there
-  // is no need to clear the canvas before painting.
-  if (!layer_is_opaque_ && !layer_fills_bounds_completely_) {
-    TRACE_EVENT0("cc", "Clear");
-    canvas->drawColor(SK_ColorTRANSPARENT, SkXfermode::kSrc_Mode);
-  }
-
-  painter_->Paint(canvas, layer_rect);
-  canvas->restore();
-
-  paint_rect_ = paint_rect;
-}
-
-void ContentLayerUpdater::SetOpaque(bool opaque) {
-  layer_is_opaque_ = opaque;
-}
-
-void ContentLayerUpdater::SetFillsBoundsCompletely(bool fills_bounds) {
-  layer_fills_bounds_completely_ = fills_bounds;
-}
-
-void ContentLayerUpdater::SetBackgroundColor(SkColor background_color) {
-  background_color_ = background_color;
-}
-
-}  // namespace cc