Create core profile contexts with WGL when --enable-unsafe-es3-apis is used.

ui/gl/gl_context_wgl.cc

Index: ui/gl/gl_context_wgl.cc
diff --git a/ui/gl/gl_context_wgl.cc b/ui/gl/gl_context_wgl.cc
index 638623cea6bac82045361261418bc187e20e29aa..135c05f7bc5fed703dd2093d50fbdde3d8515179 100644
--- a/ui/gl/gl_context_wgl.cc
+++ b/ui/gl/gl_context_wgl.cc
@@ -6,6 +6,7 @@
 
 #include "ui/gl/gl_context_wgl.h"
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
@@ -25,8 +26,42 @@ bool GLContextWGL::Initialize(
   // and could potentially be returned by GetHandle.
   HGLRC share_handle = static_cast<HGLRC>(share_group()->GetHandle());
 
-  context_ = wglCreateContext(
-      static_cast<HDC>(compatible_surface->GetHandle()));
+  HDC device_context = static_cast<HDC>(compatible_surface->GetHandle());
+  bool has_wgl_create_context_arb =
+      strstr(wglGetExtensionsStringARB(device_context),
+             "WGL_ARB_create_context") != nullptr;
+  bool create_core_profile = has_wgl_create_context_arb &&
+                             base::CommandLine::ForCurrentProcess()->HasSwitch(
+                                 switches::kEnableUnsafeES3APIs);
+
+  if (create_core_profile) {
+    std::pair<int, int> attempt_versions[] = {
+        {4, 5}, {4, 4}, {4, 3}, {4, 2}, {4, 1}, {4, 0}, {3, 3}, {3, 2},
+    };
+
+    for (const auto& version : attempt_versions) {
+      const int attribs[] = {
+          WGL_CONTEXT_MAJOR_VERSION_ARB,
+          version.first,
+          WGL_CONTEXT_MINOR_VERSION_ARB,
+          version.second,
+          WGL_CONTEXT_PROFILE_MASK_ARB,
+          WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
+          0,
+          0,
+      };
+
+      context_ =
+          wglCreateContextAttribsARB(device_context, share_handle, attribs);
+      if (context_) {
+        break;
+      }
+    }
+  }
+
+  if (!context_) {
+    context_ = wglCreateContext(device_context);
+  }
   if (!context_) {
     LOG(ERROR) << "Failed to create GL context.";
     Destroy();