gpu: Add support for GLX_EXT_texture_from_pixmap extension.

gpu/command_buffer/service/texture_manager_unittest.cc

Index: gpu/command_buffer/service/texture_manager_unittest.cc
diff --git a/gpu/command_buffer/service/texture_manager_unittest.cc b/gpu/command_buffer/service/texture_manager_unittest.cc
index 5079e7713d10f6072a71443adbbe051de2253896..ea357323ff9674f321d5aef2f68dc7abac86a1b4 100644
--- a/gpu/command_buffer/service/texture_manager_unittest.cc
+++ b/gpu/command_buffer/service/texture_manager_unittest.cc
@@ -972,6 +972,26 @@ TEST_F(TextureInfoTest, UseDeletedTexture) {
   info = NULL;
 }
 
+TEST_F(TextureInfoTest, GetLevelImage) {
+  manager_.SetInfoTarget(info_, GL_TEXTURE_2D);
+  manager_.SetLevelInfo(info_,
+      GL_TEXTURE_2D, 1, GL_RGBA, 2, 2, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, true);
+  EXPECT_TRUE(info_->GetLevelImage(GL_TEXTURE_2D, 1) == NULL);
+  // Set image.
+  manager_.SetLevelImage(info_,
+      GL_TEXTURE_2D, 1, gfx::GLImage::CreatePixmapGLImage(NULL));
+  EXPECT_FALSE(info_->GetLevelImage(GL_TEXTURE_2D, 1) == NULL);
+  // Remove it.
+  manager_.SetLevelImage(info_, GL_TEXTURE_2D, 1, NULL);
+  EXPECT_TRUE(info_->GetLevelImage(GL_TEXTURE_2D, 1) == NULL);
+  manager_.SetLevelImage(info_,
+      GL_TEXTURE_2D, 1, gfx::GLImage::CreatePixmapGLImage(NULL));
+  // Image should be reset when SetLevelInfo is called.
+  manager_.SetLevelInfo(info_,
+      GL_TEXTURE_2D, 1, GL_RGBA, 2, 2, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, true);
+  EXPECT_TRUE(info_->GetLevelImage(GL_TEXTURE_2D, 1) == NULL);
+}
+
 }  // namespace gles2
 }  // namespace gpu