Revert of Revert of 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..5868a39e7d22add6a914351a166d6d28e0d08188 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -620,6 +620,20 @@
 };
 
 /**
+ * The compressed texture formats that may be supported by the renderer.
+ * Make sure to check for the required capabilities using
+ * GrDrawTargetCaps::compressedTextureSupport
+ */
+enum GrCompressedFormat {
+    kETC1_GrCompressedFormat,
+    kETC2_GrCompressedFormat,
+    kDXT1_GrCompressedFormat,
+
+    kLast_GrCompressedFormat = kDXT1_GrCompressedFormat
+};
+static const int kGrCompressedFormatCount = kLast_GrCompressedFormat + 1;
+
+/**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;