[ios blink] Fix ios build failure

The compositor_unittests were failing to link. Move the implementation
of the interface class beside the definition.

Change-Id: I0968cf3d17b4eba7e584bc64542506f87f3cd4d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6005995
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1380655}

content/browser/renderer_host/render_widget_host_view_ios_uiview.mm

@@ -11,12 +11,6 @@
 
 static void* kObservingContext = &kObservingContext;
 
-@implementation CALayerFrameSinkProvider
-- (ui::CALayerFrameSink*)frameSink {
-  return nil;
-}
-@end
-
 @interface BETextPosition : UITextPosition {
   CGRect rect_;
 }

ui/accelerated_widget_mac/BUILD.gn

@@ -34,7 +34,10 @@ component("accelerated_widget_mac") {
   ]
 
   if (is_ios) {
-    sources += [ "ca_layer_frame_sink_provider.h" ]
+    sources += [
+      "ca_layer_frame_sink_provider.h",
+      "ca_layer_frame_sink_provider.mm",
+    ]
   }
 
   if (is_mac) {

ui/accelerated_widget_mac/ca_layer_frame_sink_provider.h

@@ -5,6 +5,8 @@
 #ifndef UI_ACCELERATED_WIDGET_MAC_CA_LAYER_FRAME_SINK_PROVIDER_H_
 #define UI_ACCELERATED_WIDGET_MAC_CA_LAYER_FRAME_SINK_PROVIDER_H_
 
+#include <UIKit/UIKit.h>
+
 #include "ui/accelerated_widget_mac/accelerated_widget_mac_export.h"
 #include "ui/gfx/ca_layer_params.h"
 #include "ui/gfx/native_widget_types.h"

ui/accelerated_widget_mac/ca_layer_frame_sink_provider.mm

@@ -0,0 +1,11 @@
+// Copyright 2024 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ui/accelerated_widget_mac/ca_layer_frame_sink_provider.h"
+
+@implementation CALayerFrameSinkProvider
+- (ui::CALayerFrameSink*)frameSink {
+  return nil;
+}
+@end