Add config msaa4 to gm (not run by default) and make MSAA configs not run unless

gm/gmmain.cpp

Index: gm/gmmain.cpp
===================================================================
--- gm/gmmain.cpp	(revision 8217)
+++ gm/gmmain.cpp	(working copy)
@@ -163,6 +163,7 @@
     int                             fSampleCnt;     // GPU backend only
     ConfigFlags                     fFlags;
     const char*                     fName;
+    bool                            fRunByDefault;
 };
 
 class BWTextDrawFilter : public SkDrawFilter {
@@ -984,33 +985,31 @@
                                                            kWrite_ConfigFlag;
 
 static const ConfigData gRec[] = {
-    { SkBitmap::kARGB_8888_Config, kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "8888" },
+    { SkBitmap::kARGB_8888_Config, kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "8888",         true },
 #if 0   // stop testing this (for now at least) since we want to remove support for it (soon please!!!)
-    { SkBitmap::kARGB_4444_Config, kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "4444" },
+    { SkBitmap::kARGB_4444_Config, kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "4444",         true },
 #endif
-    { SkBitmap::kRGB_565_Config,   kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "565" },
-#if defined(SK_SCALAR_IS_FLOAT) && SK_SUPPORT_GPU
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kNative_GLContextType,  0, kRW_ConfigFlag,    "gpu" },
-#ifndef SK_BUILD_FOR_ANDROID
-    // currently we don't want to run MSAA tests on Android
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kNative_GLContextType, 16, kRW_ConfigFlag,    "msaa16" },
-#endif
+    { SkBitmap::kRGB_565_Config,   kRaster_Backend, kDontCare_GLContextType,                  0, kRW_ConfigFlag,    "565",          true },
+#if SK_SUPPORT_GPU
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kNative_GLContextType,  0, kRW_ConfigFlag,    "gpu",          true },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kNative_GLContextType, 16, kRW_ConfigFlag,    "msaa16",       true },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kNative_GLContextType,  4, kRW_ConfigFlag,    "msaa4",        false},
     /* The debug context does not generate images */
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kDebug_GLContextType,   0, kNone_ConfigFlag,  "debug" },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kDebug_GLContextType,   0, kNone_ConfigFlag,  "debug",        true },
 #if SK_ANGLE
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kANGLE_GLContextType,   0, kRW_ConfigFlag,    "angle" },
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kANGLE_GLContextType,  16, kRW_ConfigFlag,    "anglemsaa16" },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kANGLE_GLContextType,   0, kRW_ConfigFlag,    "angle"         true },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kANGLE_GLContextType,  16, kRW_ConfigFlag,    "anglemsaa16",  true },
 #endif // SK_ANGLE
 #ifdef SK_MESA
-    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kMESA_GLContextType,    0, kRW_ConfigFlag,    "mesa" },
+    { SkBitmap::kARGB_8888_Config, kGPU_Backend,    GrContextFactory::kMESA_GLContextType,    0, kRW_ConfigFlag,    "mesa",         true },
 #endif // SK_MESA
-#endif // defined(SK_SCALAR_IS_FLOAT) && SK_SUPPORT_GPU
+#endif // SK_SUPPORT_GPU
 #ifdef SK_SUPPORT_XPS
     /* At present we have no way of comparing XPS files (either natively or by converting to PNG). */
-    { SkBitmap::kARGB_8888_Config, kXPS_Backend,    kDontCare_GLContextType,                  0, kWrite_ConfigFlag, "xps" },
+    { SkBitmap::kARGB_8888_Config, kXPS_Backend,    kDontCare_GLContextType,                  0, kWrite_ConfigFlag, "xps",          true },
 #endif // SK_SUPPORT_XPS
 #ifdef SK_SUPPORT_PDF
-    { SkBitmap::kARGB_8888_Config, kPDF_Backend,    kDontCare_GLContextType,                  0, kPDFConfigFlags,   "pdf" },
+    { SkBitmap::kARGB_8888_Config, kPDF_Backend,    kDontCare_GLContextType,                  0, kPDFConfigFlags,   "pdf",          true },
 #endif // SK_SUPPORT_PDF
 };
 
@@ -1354,9 +1353,11 @@
     }
 
     if (!userConfig) {
-        // if no config is specified by user, we add them all.
+        // if no config is specified by user, add the defaults
         for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
-            *configs.append() = i;
+            if (gRec[i].fRunByDefault) {
+                *configs.append() = i;
+            }
         }
     }
     // now remove any explicitly excluded configs
@@ -1369,6 +1370,28 @@
         }
     }
 
+#if SK_SUPPORT_GPU
+    GrContextFactory* grFactory = new GrContextFactory;
+    for (int i = 0; i < configs.count(); ++i) {
+        int index = configs[i];
+        if (kGPU_Backend == gRec[index].fBackend) {
+            GrContext* ctx = grFactory->get(gRec[index].fGLContextType);
+            if (NULL == ctx) {
+                SkDebugf("GrContext could not be created for config %s. Config will be skipped.",
+                         gRec[index].fName);
+                configs.remove(i);
+                --i;
+            }
+            if (gRec[index].fSampleCnt > ctx->getMaxSampleCount()) {
+                SkDebugf("Sample count (%d) of config %s is not supported. Config will be skipped.",
+                         gRec[index].fSampleCnt, gRec[index].fName);
+                configs.remove(i);
+                --i;
+            }
+        }
+    }
+#endif
+
     if (doVerbose) {
         SkString str;
         str.printf("%d configs:", configs.count());
@@ -1419,10 +1442,6 @@
     int testsFailed = 0;
     int testsMissingReferenceImages = 0;
 
-#if SK_SUPPORT_GPU
-    GrContextFactory* grFactory = new GrContextFactory;
-#endif
-
     int gmIndex = -1;
     SkString moduloStr;