Add onGetBlendInfo to GrXferProcessor

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 2e3dd1f039b5bb178eb420680bb2bf6da9610327..89f1f9ba65cda6671eff1ee548483b9ecb8c85ee 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -114,8 +114,9 @@ bool GrGLInterface::validate() const {
         NULL == fFunctions.fBindAttribLocation ||
         NULL == fFunctions.fBindBuffer ||
         NULL == fFunctions.fBindTexture ||
+        NULL == fFunctions.fBlendColor ||      // -> GL >= 1.4 or extension, ES >= 2.0
+        NULL == fFunctions.fBlendEquation ||   // -> GL >= 1.4 or extension, ES >= 2.0
         NULL == fFunctions.fBlendFunc ||
-        NULL == fFunctions.fBlendColor ||      // -> GL >= 1.4, ES >= 2.0 or extension
         NULL == fFunctions.fBufferData ||
         NULL == fFunctions.fBufferSubData ||
         NULL == fFunctions.fClear ||
@@ -306,6 +307,28 @@ bool GrGLInterface::validate() const {
         }
     }
 
+    // glTextureBarrier is part of desktop 4.5. There are also ARB and NV extensions.
+    if (kGL_GrGLStandard == fStandard) {
+        if (glVer >= GR_GL_VER(4,5) ||
+            fExtensions.has("GL_ARB_texture_barrier") ||
+            fExtensions.has("GL_NV_texture_barrier")) {
+            if (NULL == fFunctions.fTextureBarrier) {
+                RETURN_FALSE_INTERFACE
+            }
+        }
+    } else if (fExtensions.has("GL_NV_texture_barrier")) {
+        if (NULL == fFunctions.fTextureBarrier) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
+    if (fExtensions.has("GL_KHR_blend_equation_advanced") ||
+        fExtensions.has("GL_NV_blend_equation_advanced")) {
+        if (NULL == fFunctions.fBlendBarrier) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
     if (fExtensions.has("GL_EXT_discard_framebuffer")) {
 // FIXME: Remove this once Chromium is updated to provide this function
 #if 0