Re-add snap-back behavior (Chrome side)

content/renderer/render_thread_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 98 matching lines @@
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/WebScriptController.h"
 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "third_party/skia/include/core/SkGraphics.h"
 #include "ui/base/layout.h"
 #include "ui/base/ui_base_switches.h"
 #include "v8/include/v8.h"
 #include "webkit/renderer/compositor_bindings/web_external_bitmap_impl.h"
 
+#if defined(OS_ANDROID)
+#include <cpu-features.h>
+#include "content/renderer/android/synchronous_compositor_factory.h"
+#include "content/renderer/media/android/renderer_demuxer_android.h"
+#endif
+
+#if defined(OS_MACOSX)
+#include "content/renderer/webscrollbarbehavior_impl_mac.h"
+#endif
+
+#if defined(OS_POSIX)
+#include "ipc/ipc_channel_posix.h"
+#endif
+
 #if defined(OS_WIN)
 #include <windows.h>
 #include <objbase.h>
 #else
 // TODO(port)
 #include "base/memory/scoped_handle.h"
 #include "content/child/npapi/np_channel_base.h"
 #endif
 
-#if defined(OS_POSIX)
-#include "ipc/ipc_channel_posix.h"
-#endif
-
-#if defined(OS_ANDROID)
-#include <cpu-features.h>
-#include "content/renderer/android/synchronous_compositor_factory.h"
-#include "content/renderer/media/android/renderer_demuxer_android.h"
-#endif
-
 #if defined(ENABLE_PLUGINS)
 #include "content/renderer/npapi/plugin_channel_host.h"
 #endif
 
 using base::ThreadRestrictions;
 using blink::WebDocument;
 using blink::WebFrame;
 using blink::WebNetworkStateNotifier;
 using blink::WebRuntimeFeatures;
 using blink::WebScriptController;
@@ skipping 1159 matching lines @@
 }
 #endif
 
 #if defined(OS_MACOSX)
 void RenderThreadImpl::OnUpdateScrollbarTheme(
     float initial_button_delay,
     float autoscroll_button_delay,
     bool jump_on_track_click,
     blink::ScrollerStyle preferred_scroller_style,
     bool redraw) {
+  static_cast<WebScrollbarBehaviorImpl*>(
+      webkit_platform_support_->scrollbarBehavior())->set_jump_on_track_click(
+          jump_on_track_click);
   blink::WebScrollbarTheme::updateScrollbars(initial_button_delay,
                                              autoscroll_button_delay,
-                                             jump_on_track_click,
                                              preferred_scroller_style,
                                              redraw);
 }
 #endif
 
 void RenderThreadImpl::OnMemoryPressure(
     base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
   base::allocator::ReleaseFreeMemory();
 
   if (memory_pressure_level ==
@@ skipping 81 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content