Fix order of low memory check.

Certain builds of Fuchsia set low-end device flag, which forces
SysInfo::AmountOfPhysicalMemory to return 512 MB.

This corrects an ordering issue introduced in crrev.com/c/2419555

Bug: 1126490, 1130036
Change-Id: I8d0520cc0393864265b2ad8c4646b146b7bcf547
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421300Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808996}

components/viz/common/features.cc

@@ -105,16 +105,20 @@ bool IsUsingSkiaRenderer() {
   if (base::android::BuildInfo::GetInstance()->sdk_int() <=
       base::android::SDK_VERSION_KITKAT)
     return false;
-
-  // https://crbug.com/1126490 Mali-400 with <= 512 MB is currently broken.
-  if (base::SysInfo::AmountOfPhysicalMemoryMB() <= 512)
-    return false;
 #endif
 
   // Viz for webview requires SkiaRenderer.
   if (IsUsingVizForWebView())
     return true;
 
+#if defined(OS_ANDROID)
+  // https://crbug.com/1126490 Mali-400 with <= 512 MB is currently broken.
+  // Must be checked after IsUsingVizForWebView because it requires
+  // SkiaRenderer.
+  if (base::SysInfo::AmountOfPhysicalMemoryMB() <= 512)
+    return false;
+#endif
+
   return base::FeatureList::IsEnabled(kUseSkiaRenderer) ||
          base::FeatureList::IsEnabled(kVulkan);
 }