Determine GPU process cache directory at runtime

https://bugs.webkit.org/show_bug.cgi?id=265415
rdar://118857333

Reviewed by Brent Fulgham.

If the GPU process is running as an extension, the cache directory will be different.

* Source/WebKit/UIProcess/GPU/GPUProcessProxy.cpp:
(WebKit::gpuProcessCachesDirectory):
(WebKit::GPUProcessProxy::GPUProcessProxy):

Canonical link: https://commits.webkit.org/271208@main

Source/WebKit/UIProcess/GPU/GPUProcessProxy.cpp

@@ -116,13 +116,14 @@ GPUProcessProxy* GPUProcessProxy::singletonIfCreated()
 }
 
 #if USE(SANDBOX_EXTENSIONS_FOR_CACHE_AND_TEMP_DIRECTORY_ACCESS)
-static String gpuProcessCachesDirectory()
+static String gpuProcessCachesDirectory(bool isExtension)
 {
-#if USE(EXTENSIONKIT)
-    constexpr ASCIILiteral cacheDirectory = "/Library/Caches/com.apple.WebKit.GPUExtension/"_s;
-#else
-    constexpr ASCIILiteral cacheDirectory = "/Library/Caches/com.apple.WebKit.GPU/"_s;
-#endif
+    ASCIILiteral cacheDirectory;
+    if (isExtension)
+        cacheDirectory = "/Library/Caches/com.apple.WebKit.GPUExtension/"_s;
+    else
+        cacheDirectory = "/Library/Caches/com.apple.WebKit.GPU/"_s;
+
     String path = WebsiteDataStore::cacheDirectoryInContainerOrHomeDirectory(cacheDirectory);
 
     FileSystem::makeAllDirectories(path);
@@ -159,7 +160,11 @@ GPUProcessProxy::GPUProcessProxy()
     parameters.parentPID = getCurrentProcessID();
 
 #if USE(SANDBOX_EXTENSIONS_FOR_CACHE_AND_TEMP_DIRECTORY_ACCESS)
-    auto containerCachesDirectory = resolveAndCreateReadWriteDirectoryForSandboxExtension(gpuProcessCachesDirectory());
+    bool isExtension = false;
+#if USE(EXTENSIONKIT)
+    isExtension = !!extensionProcess();
+#endif
+    auto containerCachesDirectory = resolveAndCreateReadWriteDirectoryForSandboxExtension(gpuProcessCachesDirectory(isExtension));
     auto containerTemporaryDirectory = WebsiteDataStore::defaultResolvedContainerTemporaryDirectory();
 
     if (!containerCachesDirectory.isEmpty()) {