Add GL indirect drawing APIs

include/gpu/gl/GrGLTypes.h

Index: include/gpu/gl/GrGLTypes.h
diff --git a/include/gpu/gl/GrGLTypes.h b/include/gpu/gl/GrGLTypes.h
index 248ce8886d4ce6c914a2ed9d866bbf11bd2fc8d6..c3f2f0fbf0870c575558c486bd0f3ddd4f458f27 100644
--- a/include/gpu/gl/GrGLTypes.h
+++ b/include/gpu/gl/GrGLTypes.h
@@ -58,10 +58,40 @@ typedef signed long int GrGLintptr;
 typedef signed long int GrGLsizeiptr;
 #endif
 typedef void* GrGLeglImage;
+
+typedef struct {

[bsalomon, 2016/02/04 16:33:41]

Do we really need typedef struct? I don't really care but we'll never compile
this with a C compiler.

[Chris Dalton, 2016/02/04 20:45:55]

No, I just wrote them as typedefs to feel more like they were copy-pasted from
gl.h.

Also I named the fields with the same names that they have in gl.h. Would it be
better to start them with an f inside of skia?

  GrGLuint fCount;
  GrGLuint fInstanceCount;
  ...

[bsalomon, 2016/02/04 21:01:15]

That's a good point, we should either go all in on Gr or GL style. I'd prefer
sticking with Gr style (fField) just to avoid having a different set of rules to
follow here.

[Chris Dalton, 2016/02/04 21:05:41]

Sounds good.

+    GrGLuint count;
+    GrGLuint instanceCount;
+    GrGLuint first;
+    GrGLuint baseInstance;  // Requires EXT_base_instance on ES.
+} GrGLDrawArraysIndirectCommand;
+
+GR_STATIC_ASSERT(16 == sizeof(GrGLDrawArraysIndirectCommand));
+
+typedef struct {
+    GrGLuint count;
+    GrGLuint instanceCount;
+    GrGLuint firstIndex;
+    GrGLuint baseVertex;
+    GrGLuint baseInstance;  // Requires EXT_base_instance on ES.
+} GrGLDrawElementsIndirectCommand;
+
+GR_STATIC_ASSERT(20 == sizeof(GrGLDrawElementsIndirectCommand));
+
 /**
- * EGL types.
+ * KHR_debug
  */
+typedef void (GR_GL_FUNCTION_TYPE* GRGLDEBUGPROC)(GrGLenum source,
+                                                  GrGLenum type,
+                                                  GrGLuint id,
+                                                  GrGLenum severity,
+                                                  GrGLsizei length,
+                                                  const GrGLchar* message,
+                                                  const void* userParam);
 
+/**
+ * EGL types.
+ */
 typedef void* GrEGLImage;
 typedef void* GrEGLDisplay;
 typedef void* GrEGLContext;