Add ANGLE Platform implementation.

ui/gl/gl_implementation_win.cc

Index: ui/gl/gl_implementation_win.cc
diff --git a/ui/gl/gl_implementation_win.cc b/ui/gl/gl_implementation_win.cc
index 477f5a5b4b3118a5e4f66ddcc80ecbbc0e7cbe64..7bea3e673bbb5406ceb06c1bcf483843246f75e9 100644
--- a/ui/gl/gl_implementation_win.cc
+++ b/ui/gl/gl_implementation_win.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/native_library.h"
 #include "base/path_service.h"
@@ -16,6 +17,8 @@
 #include "base/threading/thread_restrictions.h"
 #include "base/trace_event/trace_event.h"
 #include "base/win/windows_version.h"
+// TODO(jmadill): Apply to all platforms eventually
+#include "ui/gl/angle_platform_impl.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_stub_with_extensions.h"
 #include "ui/gl/gl_egl_api_implementation.h"
@@ -97,6 +100,10 @@ typedef void (__stdcall *SetTraceFunctionPointersFunc)(
     GetCategoryEnabledFlagFunc get_category_enabled_flag,
     AddTraceEventFunc add_trace_event_func);
 
+// TODO(jmadill): Apply to all platforms eventually
+base::LazyInstance<ANGLEPlatformImpl> g_angle_platform_impl =
+    LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
@@ -111,6 +118,23 @@ bool InitializeStaticGLBindings(GLImplementation implementation) {
   // later switch to another GL implementation.
   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
 
+  // Init ANGLE platform here, before we call GetPlatformDisplay().
+  // TODO(jmadill): Apply to all platforms eventually
+  base::NativeLibrary libGLESv2_module = base::LoadNativeLibrary(
+      base::FilePath(L"libGLESv2.dll"),
+      nullptr);
+
+  if (libGLESv2_module) {
+    ANGLEPlatformInitializeFunc initFunc =
+        reinterpret_cast<ANGLEPlatformInitializeFunc>(
+            base::GetFunctionPointerFromNativeLibrary(
+                libGLESv2_module,
+                "ANGLEPlatformInitialize"));
+    if (initFunc) {
+      initFunc(&g_angle_platform_impl.Get());
+    }
+  }

[piman, 2015/03/18 19:27:07]

I think we'd only want to do this in the kGLImplementationEGLGLES2 path. Also,
we already load the DLL there (l. 207), so should all this move to l.213?

[Jamie Madill, 2015/03/18 21:01:50]

Done.

+
   // Allow the main thread or another to initialize these bindings
   // after instituting restrictions on I/O. Going forward they will
   // likely be used in the browser process on most platforms. The
@@ -348,6 +372,22 @@ void InitializeDebugGLBindings() {
 }
 
 void ClearGLBindings() {
+  // TODO(jmadill): Apply to all platforms eventually
+  base::NativeLibrary libGLESv2_module = base::LoadNativeLibrary(
+      base::FilePath(L"libGLESv2.dll"),
+      nullptr);
+
+  if (libGLESv2_module) {
+    ANGLEPlatformShutdownFunc shutdownFunc =

[piman, 2015/03/18 19:27:07]

We could just lookup this function at the same time we lookup the init one, just
keeping it in a global? That way we don't have to LoadNativeLibrary again.

[Jamie Madill, 2015/03/18 21:01:50]

Done.

+        reinterpret_cast<ANGLEPlatformShutdownFunc>(
+            base::GetFunctionPointerFromNativeLibrary(
+                libGLESv2_module,
+                "ANGLEPlatformShutdown"));
+    if (shutdownFunc) {
+      shutdownFunc();
+    }
+  }
+
   ClearGLBindingsEGL();
   ClearGLBindingsGL();
   ClearGLBindingsOSMESA();