Resolves layering violation in SynchronousCompositorHost creation

content/browser/android/synchronous_compositor_host.cc

 // Copyright 2015 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/browser/android/synchronous_compositor_host.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/shared_memory.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "content/browser/android/synchronous_compositor_browser_filter.h"
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
-#include "content/browser/web_contents/web_contents_android.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/android/sync_compositor_messages.h"
 #include "content/common/android/sync_compositor_statics.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/content_switches.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "ui/events/blink/did_overscroll_params.h"
 #include "ui/gfx/skia_util.h"
 
 namespace content {
 
 // static
-void SynchronousCompositor::SetClientForWebContents(
-    WebContents* contents,
-    SynchronousCompositorClient* client) {
-  DCHECK(contents);
-  DCHECK(client);
-  WebContentsAndroid* web_contents_android =
-      static_cast<WebContentsImpl*>(contents)->GetWebContentsAndroid();
-  DCHECK(!web_contents_android->synchronous_compositor_client());
-  web_contents_android->set_synchronous_compositor_client(client);
-}
-
-// static
 std::unique_ptr<SynchronousCompositorHost> SynchronousCompositorHost::Create(
-    RenderWidgetHostViewAndroid* rwhva,
-    WebContents* web_contents) {
-  DCHECK(web_contents);
-  WebContentsAndroid* web_contents_android =
-      static_cast<WebContentsImpl*>(web_contents)->GetWebContentsAndroid();
-  if (!web_contents_android->synchronous_compositor_client())
+    RenderWidgetHostViewAndroid* rwhva) {
+  if (!rwhva->synchronous_compositor_client())
     return nullptr;  // Not using sync compositing.
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   bool use_in_proc_software_draw =
       command_line->HasSwitch(switches::kSingleProcess);
   return base::WrapUnique(new SynchronousCompositorHost(
-      rwhva, web_contents_android->synchronous_compositor_client(),
-      use_in_proc_software_draw));
+      rwhva, use_in_proc_software_draw));
 }
 
 SynchronousCompositorHost::SynchronousCompositorHost(
     RenderWidgetHostViewAndroid* rwhva,
-    SynchronousCompositorClient* client,
     bool use_in_proc_software_draw)
     : rwhva_(rwhva),
-      client_(client),
+      client_(rwhva->synchronous_compositor_client()),
       ui_task_runner_(BrowserThread::GetTaskRunnerForThread(BrowserThread::UI)),
       process_id_(rwhva_->GetRenderWidgetHost()->GetProcess()->GetID()),
       routing_id_(rwhva_->GetRenderWidgetHost()->GetRoutingID()),
       sender_(rwhva_->GetRenderWidgetHost()),
       use_in_process_zero_copy_software_draw_(use_in_proc_software_draw),
       bytes_limit_(0u),
       renderer_param_version_(0u),
       need_animate_scroll_(false),
       need_invalidate_count_(0u),
       did_activate_pending_tree_count_(0u) {
@@ skipping 344 matching lines @@
   if (params.page_scale_factor) {
     client_->UpdateRootLayerState(
         this, gfx::ScrollOffsetToVector2dF(params.total_scroll_offset),
         gfx::ScrollOffsetToVector2dF(params.max_scroll_offset),
         params.scrollable_size, params.page_scale_factor,
         params.min_page_scale_factor, params.max_page_scale_factor);
   }
 }
 
 }  // namespace content