Workaround for Intel 6xxx clear to 0/1 bug

ui/gl/gl_gl_api_implementation.h

Index: ui/gl/gl_gl_api_implementation.h
diff --git a/ui/gl/gl_gl_api_implementation.h b/ui/gl/gl_gl_api_implementation.h
index ba66b85ddf639241beb3916df95e0cae6acc2418..06ea68564e5c6e6804811fa0495b41fdeefe1167 100644
--- a/ui/gl/gl_gl_api_implementation.h
+++ b/ui/gl/gl_gl_api_implementation.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_export.h"
+#include "ui/gl/gl_workarounds.h"
 
 namespace base {
 class CommandLine;
@@ -103,6 +104,10 @@ class GL_EXPORT RealGLApi : public GLApiBase {
                                           GLsizei height) override;
 
   void glClearFn(GLbitfield mask) override;
+  void glClearColorFn(GLclampf red,
+                      GLclampf green,
+                      GLclampf blue,
+                      GLclampf alpha) override;
   void glDrawArraysFn(GLenum mode, GLint first, GLsizei count) override;
   void glDrawElementsFn(GLenum mode,
                         GLsizei count,
@@ -113,6 +118,7 @@ class GL_EXPORT RealGLApi : public GLApiBase {
   void glDepthRangeFn(GLclampd z_near, GLclampd z_far) override;
 
   void InitializeFilteredExtensions();
+  void setGLWorkarounds(const GLWorkarounds& workarounds);

[Zhenyao Mo, 2017/07/12 17:00:15]

You need to either name it SetGLWorkarounds() or set_gl_workarounds()

[jiajia.qin, 2017/07/12 18:29:44]

Done. Rename to set_gl_workarounds()

   void set_version(std::unique_ptr<GLVersionInfo> version);
 
  private:
@@ -121,6 +127,7 @@ class GL_EXPORT RealGLApi : public GLApiBase {
   std::vector<std::string> filtered_exts_;
   std::string filtered_exts_str_;
 
+  GLWorkarounds gl_workarounds_;
   std::unique_ptr<GLVersionInfo> version_;
 
 #if DCHECK_IS_ON()