Fix angle::Platform export definitions.

include/platform/Platform.h

@@ -15,6 +15,8 @@
 #if defined(_WIN32)
 #   if !defined(LIBANGLE_IMPLEMENTATION)
 #       define ANGLE_PLATFORM_EXPORT __declspec(dllimport)
+#   else
+#       define ANGLE_PLATFORM_EXPORT __declspec(dllexport)
 #   endif
 #elif defined(__GNUC__) || defined(__clang__)
 #   define ANGLE_PLATFORM_EXPORT __attribute__((visibility ("default")))
@@ -264,6 +266,8 @@ inline void DefaultCacheProgram(PlatformMethods *platform,
 
 struct ANGLE_PLATFORM_EXPORT PlatformMethods
 {
+    PlatformMethods();
+
     // User data pointer for any implementation specific members. Put it at the start of the
     // platform structure so it doesn't become overwritten if one version of the platform
     // adds or removes new members.

src/libANGLE/Platform.cpp

@@ -18,6 +18,10 @@ namespace
 angle::PlatformMethods g_platformMethods;
 }  // anonymous namespace
 
+angle::PlatformMethods::PlatformMethods()
+{
+}
+
 angle::PlatformMethods *ANGLEPlatformCurrent()
 {
     return &g_platformMethods;

src/libGLESv2/libGLESv2.def

@@ -410,7 +410,3 @@ EXPORTS
     glVertexAttribIFormat           @410
     glVertexAttribBinding           @411
     glVertexBindingDivisor          @412
-
-    ; ANGLE Platform Implementation
-    ANGLEGetDisplayPlatform         @290
-    ANGLEResetDisplayPlatform       @291