Support horizontal/vertical only images in NineImagePainter

ui/base/nine_image_painter_factory.h

Index: ui/base/nine_image_painter_factory.h
diff --git a/ui/base/nine_image_painter_factory.h b/ui/base/nine_image_painter_factory.h
index 8a622839f4f3fd95b3c217fe24485e2bc6753136..9d8f4daede4e6a04c26d06d9f84c6d227ed25d53 100644
--- a/ui/base/nine_image_painter_factory.h
+++ b/ui/base/nine_image_painter_factory.h
@@ -23,6 +23,17 @@
       x ## _LEFT, EMPTY_IMAGE, x ## _RIGHT, \
       x ## _BOTTOM_LEFT, x ## _BOTTOM, x ## _BOTTOM_RIGHT, }
 
+// A macro to define arrays of IDR constants used with CreateImageGridPainter
+// where it can only be streched horizontally.
+#define IMAGE_GRID_HORIZONTAL(x) { x ## _LEFT, x ## _CENTER, x ## _RIGHT, \
+      EMPTY_IMAGE, EMPTY_IMAGE, EMPTY_IMAGE, \
+      EMPTY_IMAGE, EMPTY_IMAGE, EMPTY_IMAGE}
+
+// A macro to define arrays of IDR constants used with CreateImageGridPainter
+// where it can only be streched vertically.
+#define IMAGE_GRID_VERTICAL(x) { x ## _TOP, EMPTY_IMAGE, EMPTY_IMAGE, \
+        x ## _CENTER, EMPTY_IMAGE, EMPTY_IMAGE, \
+        x ## _BOTTOM, EMPTY_IMAGE, EMPTY_IMAGE}
 
 namespace gfx {
 class NineImagePainter;
@@ -30,6 +41,8 @@ class NineImagePainter;
 
 namespace ui {
 
+const int kImageGridNum = 9;

[oshima, 2014/12/15 19:25:25]

I added this to be used to define array of the image grid.
context:

https://codereview.chromium.org/798163003/diff/20001/ash/system/tray/tray_bac...

[oshima, 2014/12/15 21:26:38]

you didn't seem to like it, so removed. PTAL

+
 // Creates a NineImagePainter from an array of image ids. It's expected the
 // array came from the IMAGE_GRID macro.
 UI_BASE_EXPORT scoped_ptr<gfx::NineImagePainter> CreateNineImagePainter(