Generate platform files under platform subdir.

Source/platform/blink_platform.gyp

Index: Source/platform/blink_platform.gyp
diff --git a/Source/platform/blink_platform.gyp b/Source/platform/blink_platform.gyp
index 8837077c2c343111a0c444d0a0f6e255284bf1f7..825dd77d71dc111ee02477da1cb26b9f3321bc4d 100644
--- a/Source/platform/blink_platform.gyp
+++ b/Source/platform/blink_platform.gyp
@@ -57,6 +57,11 @@
       'BLINK_COMMON_IMPLEMENTATION=1',
       'INSIDE_BLINK',
     ],
+    'include_dirs': [
+      # FIXME: Remove these once scripts generate qualified
+      # includes correctly: http://crbug.com/380054
+      '<(blink_platform_output_dir)',
+    ],
     'sources': [
       'exported/WebCString.cpp',
       'exported/WebString.cpp',
@@ -212,7 +217,7 @@
     ],
     'include_dirs': [
       '<(angle_path)/include',
-      '<(SHARED_INTERMEDIATE_DIR)/blink',
+      '<(blink_platform_output_dir)',
     ],
     'xcode_settings': {
       # Some Mac-specific parts of WebKit won't compile without having this
@@ -225,10 +230,10 @@
       '<@(platform_heap_files)',
 
       # Additional .cpp files from platform_generated.gyp:make_platform_generated actions.
-      '<(SHARED_INTERMEDIATE_DIR)/blink/FontFamilyNames.cpp',
-      '<(SHARED_INTERMEDIATE_DIR)/blink/RuntimeEnabledFeatures.cpp',
-      '<(SHARED_INTERMEDIATE_DIR)/blink/RuntimeEnabledFeatures.h',
-      '<(SHARED_INTERMEDIATE_DIR)/blink/ColorData.cpp',
+      '<(blink_platform_output_dir)/FontFamilyNames.cpp',
+      '<(blink_platform_output_dir)/RuntimeEnabledFeatures.cpp',
+      '<(blink_platform_output_dir)/RuntimeEnabledFeatures.h',
+      '<(blink_platform_output_dir)/ColorData.cpp',
     ],
     'sources/': [
       # Exclude all platform specific things, reinclude them below on a per-platform basis