Add WSVGA skin to represent 7" tablets.

Change-Id: I0b2865e2213839265f6acf8e9e324fa7018cf336
diff --git a/build/sdk.atree b/build/sdk.atree
index 3319444..476bf16 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -87,6 +87,7 @@
 #development/tools/emulator/skins/HVGA      platforms/${PLATFORM_NAME}/skins/HVGA
 #development/tools/emulator/skins/WVGA800   platforms/${PLATFORM_NAME}/skins/WVGA800
 #development/tools/emulator/skins/WVGA854   platforms/${PLATFORM_NAME}/skins/WVGA854
+development/tools/emulator/skins/WSVGA      platforms/${PLATFORM_NAME}/skins/WSVGA
 development/tools/emulator/skins/WXGA       platforms/${PLATFORM_NAME}/skins/WXGA
 
 # Platform SDK properties