gpu: Add YCbCr 420v extension.

ui/gl/scoped_binders.cc

Index: ui/gl/scoped_binders.cc
diff --git a/ui/gl/scoped_binders.cc b/ui/gl/scoped_binders.cc
index bb2b290105622a9823b49b284d6bbd72aa6f36bc..35ce21656167c33b9fc61fc56cca61b9fadd44cd 100644
--- a/ui/gl/scoped_binders.cc
+++ b/ui/gl/scoped_binders.cc
@@ -29,6 +29,16 @@ ScopedFrameBufferBinder::~ScopedFrameBufferBinder() {
   }
 }
 
+ScopedActiveTexture::ScopedActiveTexture(unsigned int texture)
+    : old_texture_(-1) {
+  glGetIntegerv(GL_ACTIVE_TEXTURE, &old_texture_);
+  glActiveTexture(texture);
+}
+
+ScopedActiveTexture::~ScopedActiveTexture() {
+  glActiveTexture(old_texture_);
+}
+
 ScopedTextureBinder::ScopedTextureBinder(unsigned int target, unsigned int id)
     : state_restorer_(!GLContext::GetCurrent()
                           ? NULL
@@ -47,8 +57,11 @@ ScopedTextureBinder::ScopedTextureBinder(unsigned int target, unsigned int id)
       case GL_TEXTURE_EXTERNAL_OES:
         target_getter = GL_TEXTURE_BINDING_EXTERNAL_OES;
         break;
+      case GL_TEXTURE_RECTANGLE_ARB:
+        target_getter = GL_TEXTURE_BINDING_RECTANGLE_ARB;
+        break;
       default:
-        NOTIMPLEMENTED() << "Target not part of OpenGL ES 2.0 spec.";
+        NOTIMPLEMENTED() << " Target not supported.";
     }
     glGetIntegerv(target_getter, &old_id_);
   }
@@ -65,4 +78,52 @@ ScopedTextureBinder::~ScopedTextureBinder() {
   }
 }
 
+ScopedUseProgram::ScopedUseProgram(unsigned int program) : old_program_(-1) {
+  glGetIntegerv(GL_CURRENT_PROGRAM, &old_program_);
+  glUseProgram(program);
+}
+
+ScopedUseProgram::~ScopedUseProgram() {
+  glUseProgram(old_program_);
+}
+
+ScopedEnableVertexAttribArray::ScopedEnableVertexAttribArray(unsigned int index)
+    : enabled_(GL_FALSE), index_(index) {
+  glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &enabled_);
+  glEnableVertexAttribArray(index);
+}
+
+ScopedEnableVertexAttribArray::~ScopedEnableVertexAttribArray() {
+  if (enabled_ == GL_FALSE) {
+    glDisableVertexAttribArray(index_);
+  }
+}
+
+ScopedBufferBinder::ScopedBufferBinder(unsigned int target, unsigned int id)
+    : target_(target), old_id_(-1) {
+  GLenum target_getter = 0;
+  switch (target) {
+    case GL_ARRAY_BUFFER:
+      target_getter = GL_ARRAY_BUFFER_BINDING;
+      break;
+    default:
+      NOTIMPLEMENTED() << " Target not supported.";
+  }
+  glGetIntegerv(target_getter, &old_id_);
+  glBindBuffer(target_, id);
+}
+
+ScopedBufferBinder::~ScopedBufferBinder() {
+  glBindBuffer(target_, old_id_);
+}
+
+ScopedViewport::ScopedViewport(int x, int y, int width, int height) {
+  glGetIntegerv(GL_VIEWPORT, data_);
+  glViewport(x, y, width, height);
+}
+
+ScopedViewport::~ScopedViewport() {
+  glViewport(data_[0], data_[1], data_[2], data_[3]);
+}
+
 }  // namespace gfx