Support using OpenGL ES context on desktop

bench/benchmain.cpp

Index: bench/benchmain.cpp
diff --git a/bench/benchmain.cpp b/bench/benchmain.cpp
index e097fe094771fe44eaa8609dd31f3108f29dcd63..3a9f0c2a465c1b230ce45148a1451d0d45502a64 100644
--- a/bench/benchmain.cpp
+++ b/bench/benchmain.cpp
@@ -48,6 +48,11 @@ const char* BenchMode_Name[] = {
 
 static const char kDefaultsConfigStr[] = "defaults";
 
+#if SK_SUPPORT_GPU
+static const char kGpuAPINameGL[] = "gl";
+static const char kGpuAPINameGLES[] = "gles";
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 class Iter {
@@ -225,6 +230,10 @@ DEFINE_bool(forceFilter,    false,    "Force bitmap filtering?");
 DEFINE_string(forceDither, "default", "Force dithering: true, false, or default?");
 DEFINE_bool(forceBlend,     false,    "Force alpha blending?");
 
+DEFINE_string(gpuAPI, "", "Force use of specific gpu API.  Using \"gl\" "
+              "forces OpenGL API. Using \"gles\" forces OpenGL ES API. "
+              "Defaults to empty string, which selects the API native to the "
+              "system.");
 DEFINE_int32(gpuCacheBytes, -1, "GPU cache size limit in bytes.  0 to disable cache.");
 DEFINE_int32(gpuCacheCount, -1, "GPU cache size limit in object count.  0 to disable cache.");
 
@@ -346,11 +355,24 @@ int tool_main(int argc, char** argv) {
     }
 
 #if SK_SUPPORT_GPU
+    GrGLStandard gpuAPI = kNone_GrGLStandard;
+    if (1 == FLAGS_gpuAPI.count()) {
+        if (FLAGS_gpuAPI.contains(kGpuAPINameGL)) {
+            gpuAPI = kGL_GrGLStandard;
+        } else if (FLAGS_gpuAPI.contains(kGpuAPINameGLES)) {
+            gpuAPI = kGLES_GrGLStandard;
+        } else {
+            SkDebugf("Selected gpu API could not be used. Using the default.\n");
+        }
+    } else if (FLAGS_gpuAPI.count() > 1)  {
+        SkDebugf("Selected gpu API could not be used. Using the default.\n");
+    }
+
     for (int i = 0; i < configs.count(); ++i) {
         const Config& config = gConfigs[configs[i]];
 
         if (Benchmark::kGPU_Backend == config.backend) {
-            GrContext* context = gContextFactory.get(config.contextType);
+            GrContext* context = gContextFactory.get(config.contextType, gpuAPI);
             if (NULL == context) {
                 SkDebugf("GrContext could not be created for config %s. Config will be skipped.\n",
                     config.name);
@@ -410,7 +432,7 @@ int tool_main(int argc, char** argv) {
         if (Benchmark::kGPU_Backend != config.backend) {
             continue;
         }
-        GrContext* context = gContextFactory.get(config.contextType);
+        GrContext* context = gContextFactory.get(config.contextType, gpuAPI);
         if (NULL == context) {
             continue;
         }
@@ -456,7 +478,7 @@ int tool_main(int argc, char** argv) {
 #if SK_SUPPORT_GPU
             SkGLContextHelper* glContext = NULL;
             if (Benchmark::kGPU_Backend == config.backend) {
-                context = gContextFactory.get(config.contextType);
+                context = gContextFactory.get(config.contextType, gpuAPI);
                 if (NULL == context) {
                     continue;
                 }