Add support for Mac/iOS application bundles to GN tool.

tools/gn/function_toolchain.cc

Index: tools/gn/function_toolchain.cc
diff --git a/tools/gn/function_toolchain.cc b/tools/gn/function_toolchain.cc
index 58532551d4f2d65250db6002fbaf675eec20cff7..514d599a5be4e673ba3b0fae9693ce2bcc4621b4 100644
--- a/tools/gn/function_toolchain.cc
+++ b/tools/gn/function_toolchain.cc
@@ -809,7 +809,8 @@ Value RunTool(Scope* scope,
   } else if (IsLinkerTool(tool_type)) {
     subst_validator = &IsValidLinkerSubstitution;
     subst_output_validator = &IsValidLinkerOutputsSubstitution;
-  } else if (tool_type == Toolchain::TYPE_COPY) {
+  } else if (tool_type == Toolchain::TYPE_COPY ||
+             tool_type == Toolchain::TYPE_COPY_BUNDLE_DATA) {
     subst_validator = &IsValidCopySubstitution;
     subst_output_validator = &IsValidCopySubstitution;
   } else {
@@ -846,9 +847,11 @@ Value RunTool(Scope* scope,
     return Value();
   }
 
-  if (tool_type != Toolchain::TYPE_COPY && tool_type != Toolchain::TYPE_STAMP) {
-    // All tools except the copy and stamp tools should have outputs. The copy
-    // and stamp tool's outputs are generated internally.
+  if (tool_type != Toolchain::TYPE_COPY &&
+      tool_type != Toolchain::TYPE_COPY_BUNDLE_DATA &&
+      tool_type != Toolchain::TYPE_STAMP) {
+    // All tools except the copy, copy bundle data and stamp tools should have
+    // outputs. The copy and stamp tool's outputs are generated internally.
     if (!ReadOutputs(&block_scope, function, subst_output_validator,
                      tool.get(), err))
       return Value();