Revert of Revert of Add compressed texture capabilities for GPU devices

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 6d8d18463aec37f28bc34c18d7ea59b578462f04..a5b6ac6f038f0db5d5c1cde39ef066ee1f80a65d 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -1029,6 +1029,7 @@
     fMaxSampleCount = 0;
 
     memset(fConfigRenderSupport, 0, sizeof(fConfigRenderSupport));
+    memset(fCompressedFormatSupport, 0, sizeof(fCompressedFormatSupport));
 }
 
 GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
@@ -1054,6 +1055,8 @@
     fMaxSampleCount = other.fMaxSampleCount;
 
     memcpy(fConfigRenderSupport, other.fConfigRenderSupport, sizeof(fConfigRenderSupport));
+    memcpy(fCompressedFormatSupport, other.fCompressedFormatSupport,
+	   sizeof(fCompressedFormatSupport));
 
     return *this;
 }
@@ -1129,5 +1132,22 @@
                      gNY[fConfigRenderSupport[i][1]]);
         }
     }
+
+    static const char* kCompressedFormatNames[] = {
+        "ETC1",  // kETC1_GrCompressedFormat
+        "ETC2",  // kETC2_GrCompressedFormat,
+        "DXT1",  // kDXT1_GrCompressedFormat,
+    };
+    GR_STATIC_ASSERT(0 == kETC1_GrCompressedFormat);
+    GR_STATIC_ASSERT(1 == kETC2_GrCompressedFormat);
+    GR_STATIC_ASSERT(2 == kDXT1_GrCompressedFormat);
+    GR_STATIC_ASSERT(SK_ARRAY_COUNT(kCompressedFormatNames) == kGrCompressedFormatCount);
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(kCompressedFormatNames); ++i) {
+        r.appendf("%s Compressed Texture Support: %s\n",
+		  kCompressedFormatNames[i],
+		  gNY[fCompressedFormatSupport[i]]);
+    }
+
     return r;
 }