Move GN obj files to target-specific dirs

build/toolchain/win/BUILD.gn

Index: build/toolchain/win/BUILD.gn
diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index 0236c8e6cc91d8317acff23ee004cdd12ae444f0..454cddea4f53249c775e17e62900a0f0a990e107 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -88,7 +88,7 @@ template("msvc_toolchain") {
       depsformat = "msvc"
       description = "CC {{output}}"
       outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+        "{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.obj",
       ]
       rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}"
     }
@@ -105,7 +105,7 @@ template("msvc_toolchain") {
       depsformat = "msvc"
       description = "CXX {{output}}"
       outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+        "{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.obj",
       ]
       rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}"
     }
@@ -113,7 +113,7 @@ template("msvc_toolchain") {
     tool("rc") {
       command = "$python_path gyp-win-tool rc-wrapper $env rc.exe {{defines}} {{include_dirs}} /fo{{output}} {{source}}"
       outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.res",
+        "{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.res",
       ]
       description = "RC {{output}}"
     }
@@ -124,7 +124,7 @@ template("msvc_toolchain") {
       command = "$python_path gyp-win-tool asm-wrapper $env ml.exe {{defines}} {{include_dirs}} /safeseh /c /Fo {{output}} {{source}}"
       description = "ASM {{output}}"
       outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+        "{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.obj",
       ]
     }