Remove unreferenced content/browser/web_contents/web_contents_view_overscroll_ files.

content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.mm

Index: content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.mm
diff --git a/content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.mm b/content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.mm
deleted file mode 100644
index b614fb13dea0fdc0f46a06b62bb0590d29665251..0000000000000000000000000000000000000000
--- a/content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.mm
+++ /dev/null
@@ -1,259 +0,0 @@
-// 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.
-
-#import <QuartzCore/QuartzCore.h>
-
-#include "content/browser/web_contents/web_contents_view_overscroll_animator_slider_mac.h"
-
-#include "content/browser/web_contents/web_contents_impl.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace {
-// The minimum possible progress of an overscroll animation.
-CGFloat kMinProgress = 0;
-// The maximum possible progress of an overscroll animation.
-CGFloat kMaxProgress = 2.0;
-// The maximum duration of the completion or cancellation animations. The
-// effective maximum is half of this value, since the longest animation is from
-// progress = 1.0 to progress = 2.0;
-CGFloat kMaxAnimationDuration = 0.2;
-}  // namespace
-
-// OverscrollAnimatorSliderView Private Category -------------------------------
-
-@interface OverscrollAnimatorSliderView ()
-// Callback from WebContentsPaintObserver.
-- (void)webContentsFinishedNonEmptyPaint;
-
-// Resets overscroll animation state.
-- (void)reset;
-
-// Given a |progress| from 0 to 2, the expected frame origin of the -movingView.
-- (NSPoint)frameOriginWithProgress:(CGFloat)progress;
-
-// The NSView that is moving during the overscroll animation.
-- (NSView*)movingView;
-
-// The expected duration of an animation from progress_ to |progress|
-- (CGFloat)animationDurationForProgress:(CGFloat)progress;
-
-// NSView override. During an overscroll animation, the cursor may no longer
-// rest on the RenderWidgetHost's NativeView, which prevents wheel events from
-// reaching the NativeView. The overscroll animation is driven by wheel events
-// so they must be explicitly forwarded to the NativeView.
-- (void)scrollWheel:(NSEvent*)event;
-@end
-
-// Helper Class (ResizingView) -------------------------------------------------
-
-// This NSView subclass is intended to be the RenderWidgetHost's NativeView's
-// parent NSView. It is possible for the RenderWidgetHost's NativeView's size to
-// become out of sync with its parent NSView. The override of
-// -resizeSubviewsWithOldSize: ensures that the sizes will eventually become
-// consistent.
-// http://crbug.com/264207
-@interface ResizingView : NSView
-@end
-
-@implementation ResizingView
-- (void)resizeSubviewsWithOldSize:(NSSize)oldBoundsSize {
-  for (NSView* subview in self.subviews)
-    [subview setFrame:self.bounds];
-}
-@end
-
-// Helper Class (WebContentsPaintObserver) -------------------------------------
-
-namespace overscroll_animator {
-class WebContentsPaintObserver : public content::WebContentsObserver {
- public:
-  WebContentsPaintObserver(content::WebContents* web_contents,
-                           OverscrollAnimatorSliderView* slider_view)
-      : WebContentsObserver(web_contents), slider_view_(slider_view) {}
-
-  void DidFirstVisuallyNonEmptyPaint() override {
-    [slider_view_ webContentsFinishedNonEmptyPaint];
-  }
-
- private:
-  OverscrollAnimatorSliderView* slider_view_;  // Weak reference.
-};
-}  // namespace overscroll_animator
-
-// OverscrollAnimatorSliderView Implementation ---------------------------------
-
-@implementation OverscrollAnimatorSliderView
-
-- (instancetype)initWithFrame:(NSRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    bottomView_.reset([[NSImageView alloc] initWithFrame:self.bounds]);
-    bottomView_.get().imageScaling = NSImageScaleNone;
-    bottomView_.get().autoresizingMask =
-        NSViewWidthSizable | NSViewHeightSizable;
-    bottomView_.get().imageAlignment = NSImageAlignTop;
-    [self addSubview:bottomView_];
-    middleView_.reset([[ResizingView alloc] initWithFrame:self.bounds]);
-    middleView_.get().autoresizingMask =
-        NSViewWidthSizable | NSViewHeightSizable;
-    [self addSubview:middleView_];
-    topView_.reset([[NSImageView alloc] initWithFrame:self.bounds]);
-    topView_.get().autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
-    topView_.get().imageScaling = NSImageScaleNone;
-    topView_.get().imageAlignment = NSImageAlignTop;
-    [self addSubview:topView_];
-
-    [self reset];
-  }
-  return self;
-}
-
-- (void)webContentsFinishedNonEmptyPaint {
-  observer_.reset();
-  [self reset];
-}
-
-- (void)reset {
-  DCHECK(!animating_);
-  inOverscroll_ = NO;
-  progress_ = kMinProgress;
-
-  [CATransaction begin];
-  [CATransaction setDisableActions:YES];
-  bottomView_.get().hidden = YES;
-  middleView_.get().hidden = NO;
-  topView_.get().hidden = YES;
-
-  [bottomView_ setFrameOrigin:NSMakePoint(0, 0)];
-  [middleView_ setFrameOrigin:NSMakePoint(0, 0)];
-  [topView_ setFrameOrigin:NSMakePoint(0, 0)];
-  [CATransaction commit];
-}
-
-- (NSPoint)frameOriginWithProgress:(CGFloat)progress {
-  if (direction_ == content::OVERSCROLL_ANIMATOR_DIRECTION_BACKWARDS)
-    return NSMakePoint(progress / kMaxProgress * self.bounds.size.width, 0);
-  return NSMakePoint((1 - progress / kMaxProgress) * self.bounds.size.width, 0);
-}
-
-- (NSView*)movingView {
-  if (direction_ == content::OVERSCROLL_ANIMATOR_DIRECTION_BACKWARDS)
-    return middleView_;
-  return topView_;
-}
-
-- (CGFloat)animationDurationForProgress:(CGFloat)progress {
-  CGFloat progressPercentage =
-      fabs(progress_ - progress) / (kMaxProgress - kMinProgress);
-  return progressPercentage * kMaxAnimationDuration;
-}
-
-- (void)scrollWheel:(NSEvent*)event {
-  NSView* latestRenderWidgetHostView = [[middleView_ subviews] lastObject];
-  [latestRenderWidgetHostView scrollWheel:event];
-}
-
-// WebContentsOverscrollAnimator Implementation --------------------------------
-
-- (BOOL)needsNavigationSnapshot {
-  return YES;
-}
-
-- (void)beginOverscrollInDirection:
-            (content::OverscrollAnimatorDirection)direction
-                navigationSnapshot:(NSImage*)snapshot {
-  // TODO(erikchen): If snapshot is nil, need a placeholder.
-  if (animating_ || inOverscroll_)
-    return;
-
-  inOverscroll_ = YES;
-  direction_ = direction;
-  if (direction_ == content::OVERSCROLL_ANIMATOR_DIRECTION_BACKWARDS) {
-    // The middleView_ will slide to the right, revealing bottomView_.
-    bottomView_.get().hidden = NO;
-    [bottomView_ setImage:snapshot];
-  } else {
-    // The topView_ will slide in from the right, concealing middleView_.
-    topView_.get().hidden = NO;
-    [topView_ setFrameOrigin:NSMakePoint(self.bounds.size.width, 0)];
-    [topView_ setImage:snapshot];
-  }
-
-  [self updateOverscrollProgress:kMinProgress];
-}
-
-- (void)addRenderWidgetHostNativeView:(NSView*)view {
-  [middleView_ addSubview:view];
-}
-
-- (void)updateOverscrollProgress:(CGFloat)progress {
-  if (animating_)
-    return;
-  DCHECK_LE(progress, kMaxProgress);
-  DCHECK_GE(progress, kMinProgress);
-  progress_ = progress;
-  [[self movingView] setFrameOrigin:[self frameOriginWithProgress:progress]];
-}
-
-- (void)completeOverscroll:(content::WebContentsImpl*)webContents {
-  if (animating_ || !inOverscroll_)
-    return;
-
-  animating_ = YES;
-
-  NSView* view = [self movingView];
-  [NSAnimationContext beginGrouping];
-  [NSAnimationContext currentContext].duration =
-      [self animationDurationForProgress:kMaxProgress];
-  [[NSAnimationContext currentContext] setCompletionHandler:^{
-      animating_ = NO;
-
-      // Animation is complete. Now perform page load.
-      if (direction_ == content::OVERSCROLL_ANIMATOR_DIRECTION_BACKWARDS)
-        webContents->GetController().GoBack();
-      else
-        webContents->GetController().GoForward();
-
-      // Reset the position of the middleView_, but wait for the page to paint
-      // before showing it.
-      middleView_.get().hidden = YES;
-      [middleView_ setFrameOrigin:NSMakePoint(0, 0)];
-      observer_.reset(
-          new overscroll_animator::WebContentsPaintObserver(webContents, self));
-  }];
-
-  // Animate the moving view to its final position.
-  [[view animator] setFrameOrigin:[self frameOriginWithProgress:kMaxProgress]];
-
-  [NSAnimationContext endGrouping];
-}
-
-- (void)cancelOverscroll {
-  if (animating_)
-    return;
-
-  if (!inOverscroll_) {
-    [self reset];
-    return;
-  }
-
-  animating_ = YES;
-
-  NSView* view = [self movingView];
-  [NSAnimationContext beginGrouping];
-  [NSAnimationContext currentContext].duration =
-      [self animationDurationForProgress:kMinProgress];
-  [[NSAnimationContext currentContext] setCompletionHandler:^{
-      // Animation is complete. Reset the state.
-      animating_ = NO;
-      [self reset];
-  }];
-
-  // Animate the moving view to its initial position.
-  [[view animator] setFrameOrigin:[self frameOriginWithProgress:kMinProgress]];
-
-  [NSAnimationContext endGrouping];
-}
-
-@end