Fix viewport computation in Mac UC

content/browser/devtools/renderer_overrides_handler.cc

Index: content/browser/devtools/renderer_overrides_handler.cc
diff --git a/content/browser/devtools/renderer_overrides_handler.cc b/content/browser/devtools/renderer_overrides_handler.cc
index 3f5359659b81cc966994082b80051d2b100eb9eb..dafc8c7473454802afcd06c1cfc27694bc614c43 100644
--- a/content/browser/devtools/renderer_overrides_handler.cc
+++ b/content/browser/devtools/renderer_overrides_handler.cc
@@ -209,8 +209,8 @@ void RendererOverridesHandler::InnerSwapCompositorFrame() {
   cc::CompositorFrameMetadata& metadata = last_compositor_frame_metadata_;
 
   float page_scale = metadata.page_scale_factor;
-  gfx::SizeF viewport_size_dip = gfx::ScaleSize(metadata.viewport_size,
-                                                page_scale);
+  gfx::SizeF viewport_size_dip = gfx::ScaleSize(
+      metadata.scrollable_viewport_size, page_scale);
 
   float total_bar_height_dip = metadata.location_bar_content_translation.y() +
                                    metadata.overdraw_bottom_height;
@@ -608,14 +608,14 @@ void RendererOverridesHandler::ScreencastFrameCaptured(
     viewport->SetDouble(devtools::DOM::Rect::kParamY,
                         metadata.root_scroll_offset.y());
     viewport->SetDouble(devtools::DOM::Rect::kParamWidth,
-                        metadata.viewport_size.width());
+                        metadata.scrollable_viewport_size.width());
     viewport->SetDouble(devtools::DOM::Rect::kParamHeight,
-                        metadata.viewport_size.height());
+                        metadata.scrollable_viewport_size.height());
     response_metadata->Set(
         devtools::Page::ScreencastFrameMetadata::kParamViewport, viewport);
 
-    gfx::SizeF viewport_size_dip = gfx::ScaleSize(metadata.viewport_size,
-                                                  metadata.page_scale_factor);
+    gfx::SizeF viewport_size_dip = gfx::ScaleSize(
+        metadata.scrollable_viewport_size, metadata.page_scale_factor);
     response_metadata->SetDouble(
         devtools::Page::ScreencastFrameMetadata::kParamDeviceWidth,
         viewport_size_dip.width());