Bug 313839 – [CMake] Fix macOS build after 312428@main by adding rendering/cocoa to WebCore include dirs

• Status: RESOLVED
• Resolution: FIXED
• Component: CMake

[zak ridouh]

Commit 312428@main ([WebCore] Fix underlying build errors hidden by
UnifiedBuild files) added a direct `#include "RenderThemeCocoa.h"` in
Source/WebCore/page/InteractionRegion.cpp, which is gated on
ENABLE(FORM_CONTROL_REFRESH). RenderThemeCocoa.h lives in
Source/WebCore/rendering/cocoa, but that directory was never part of
WebCore_PRIVATE_INCLUDE_DIRECTORIES, so the Mac CMake port fails with:

  Source/WebCore/page/InteractionRegion.cpp:79:10: fatal error:
  'RenderThemeCocoa.h' file not found

The Xcode build happened to find the header via its own header search
paths, so the problem only shows up in the CMake Mac port.

Add rendering/cocoa to WebCore_PRIVATE_INCLUDE_DIRECTORIES in
PlatformMac.cmake so the header resolves the same way the sibling
rendering/mac directory's headers already do (via -I from other paths).

[Radar WebKit Bug Importer]

<rdar://problem/176042265>

[zak ridouh]

Pull request: https://github.com/WebKit/WebKit/pull/64057

[EWS]

Committed 312448@main (077d9a850018): <https://commits.webkit.org/312448@main>

Reviewed commits have been landed. Closing PR #64057 and removing active labels.