Add compressed texture capabilities for GPU devices

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index c1b3554c6e008eb322d18838618a53cbeeb54495..1155d5cb70ec0479bafc67dbfbab46c55d2ed53f 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -620,6 +620,17 @@ enum GrGLBackendState {
 };
 
 /**
+ * The compressed texture formats that are supported
+ */
+enum GrCompressedFormat {
+    kUncompressed_GrCompressedFormat = -1,
+    kETC1_GrCompressedFormat         =  0,
+
+    kLast_GrCompressedFormat = kETC1_GrCompressedFormat
+};
+static const size_t kCompressedFormatCount = kLast_GrCompressedFormat + 1;
+
+/**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;